| Subject | English | Spanish |
| ichtyol. | Atlantic pearl oyster | ostra perlífera atlántica Pinctada imbricata |
| industr. | baroque pearl | perla barroca |
| fish.farm. | blister pearl | perla ampolla |
| industr. | blister pearl | perla barroca |
| med. | Bohn's epithelial pearls | perla epitelial de Bohn |
| mun.plan. | button pearl | perla botón |
| pharma. | cobalt-60 pearls | perla de cobalto 60 |
| agric. | cultured pearl | perla cultivada |
| mun.plan. | drilled pearl | perla fina taladrada |
| med. | epithelia pearl | perla epitelial |
| med. | epithelia pearl | perla epidérmica |
| patents. | furniture, mirrors, picture frames, goods not included in other classes of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, shell, amber, mother-of-pearl, meerschaum and substitutes for all these materials or of plastics | muebles, espejos, marcos, productos no comprendidos en otras clases de madera, corcho, caña, junco, mimbre, cuerno, hueso, marfil, ballena, concha, ámbar, nácar, espuma de mar, sucedáneos de todas estas materias o |
| patents. | goods not included in other classes of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, shell, amber, mother-of-pearl, meerschaum and substitutes for all these materials, or of plastics | productos, no comprendidos en otras clases, de madera, corcho, caña, junco, mimbre, cuerno, hueso, marfil, ballena, concha, ámbar, nácar, espuma de mar, sucedáneos de todas estas materias o materias plásticas |
| patents. | goods included in class 20 of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, shell, amber, mother-of- pearl, meerschaum and substitutes for all these materials, or of plastics | productos comprendidos en la clase 20 de madera, corcho, caña, junco, mimbre, cuerno, hueso, marfil, ballena, concha, ámbar, nácar, espuma de mar, sucedáneos de todas estas materias o materias plásticas |
| patents. | goods, so far as included in class 20, of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, shell, amber, mother-of-pearl, meerschaum and substitutes for all these materials, or of plastics | productos, comprendidos en la clase 20, de madera, corcho, caña, junco, mimbre, cuerno, hueso, marfil, ballena, concha, ámbar, nácar, espuma de mar, sucedáneos de todas estas materias o materias plásticas |
| med. | gouty pearl | tofo auricular |
| nat.sc., agric. | ground pearl | perla de tierra (Margarodes) |
| nat.sc., agric. | ground pearl | margarode (Margarodes) |
| gen. | Ground pearls | perlas de tierra (Margarodes spp.) |
| mun.plan. | hollow imitation pearls | perlas artificiales huecas |
| med. | horned pearl | perla epidérmica |
| med. | horned pearl | perla epitelial |
| mun.plan. | imitation pearls | perlas artificiales |
| mun.plan. | imitation pearls | imitaciones de perlas finas |
| gen. | Jerusalem pearl | perla de Jerusalén |
| med. | Laennec's pearls | esputo de Laennec |
| med. | Laennec's pearls | perlas de Laennec |
| nat.sc. | mother of pearl | nácar |
| gen. | mother of pearl unworked or semi-worked | nácar en bruto o semi-elaborado |
| ichtyol. | mother-of-pearl | madreperla |
| fish.farm. | mother-of-pearl | naícar |
| patents. | mother-of-pearl | nácar |
| industr., construct., met. | mother-of-pearl bead | perla nacarada |
| labor.org. | mother-of-pearl culture | cultivo de madreperla |
| fish.farm. | mother-of-pearl shell | madreperla (Pinctada martensii, Pinctada maxima, pinctada margaritifera) |
| nat.sc., agric. | mother-of-pearl shell | ostra perlífera (Pinctada martensii, Pinctada maxima) |
| med. | mother-of-pearl stomatitis | estomatitis nacarada |
| mun.plan. | mounted pearl | perla fina montada |
| ichtyol. | natural pearl | perla natural |
| mun.plan. | natural pearl | perla fina |
| chem., met., mech.eng. | pearl ash rare | carbonato potásico |
| chem., met., mech.eng. | pearl ash rare | cenizas de perla |
| patents. | pearl barley | cebada perlada |
| agric. | pearl barley | cebada mondada |
| labor.org. | pearl culture | perlicultura |
| labor.org. | pearl culture | cultivo de perlas |
| vet.med. | pearl disease | tuberculosis bovina Mycobacterium bovis |
| fish.farm. | pearl essence | esencia de perla |
| agric. | pearl essence | esencia de Oriente |
| industr., construct. | pearl finish | pirle finish |
| fish.farm. | pearl fishery | pesquería de ostras perlíferas |
| fishery | pearl-fishing | pesca de perlas |
| med. | Pearl formula | fórmula de Pearl |
| industr., construct., chem. | pearl glue | cola en perlas |
| med. | Pearl index | índice de Pearl |
| med. | Pearl index | índice Pearl |
| earth.sc., life.sc. | pearl lightning | relámpago en rosario |
| chem., mech.eng. | pearl mill | molino de perlas |
| chem., mech.eng. | pearl mill | molino de esferillas |
| nat.res., agric. | pearl millet | mijo perla (Pennisetum glaucum, Pennisetum typhoideum) |
| bot. | pearl millet | panizo manchego Pennisetum glaucum |
| bot. | pearl millet | panizo negro Pennisetum glaucum |
| bot. | pearl millet | mijo perla Pennisetum glaucum |
| entomol. | pearl millet and sorghum stem borer | barrenador del tallo del mijo y el sorgo Acigona ignefusalis |
| agric. | pearl moss | musgo de Irlanda |
| agric. | pearl moss | alga carragheen |
| agric. | pearl moss | musgo perlado |
| forestr. | pearl mussel | mejillón perla (Margaritifera margaritifera) |
| nat.res., fish.farm. | pearl mussel | margaritana (Margaritana margaritifera) |
| nat.res., fish.farm. | pearl mussel | molusco perlífero (Margaritana margaritifera) |
| earth.sc., life.sc. | pearl necklace lightning | relámpago en rosario |
| industr. | pearl necklace with a gold fastener | collar de perlas con cierre de oro |
| med. | Pearl operation | operación de Pearl |
| agric. | pearl oyster | madreperla |
| med. | "pearl" phenomenon | fenómeno "perla" |
| plast. | pearl polymerization | polimerización en suspensión |
| stat. | Pearl-Read curve | curva logística |
| math. | Pearl-Read curve | curva logìstica |
| math. | Pearl-Read curve | curva de Pearl-Read |
| stat. | Pearl-Reed growth curve | curva de crecimiento de Pearl-Reed |
| stat. | Pearl-Reed growth curve | curva autocatalítica |
| gen. | pearl rice | arroz glutinoso |
| earth.sc. | pearl spar | dolomita |
| earth.sc. | pearl spar | dolomía |
| earth.sc. | pearl spar | espato perla |
| chem. | pearl starch | almidón quebradizo |
| chem. | pearl starch | almidón grumoso |
| med. | pearl string comparison | tipo cuerda perlada |
| food.ind. | pearl sugar | azúcar perlado |
| industr. | pearl sugar production unit | centro destinado a la preparación del azúcar perlado |
| earth.sc., industr., construct. | pearl white | blanco de perla |
| food.ind. | pearl wine. | vino con aguja |
| med. | pearl workers'asthma | asma de los trabajadores de la madreperla |
| gen. | pearls made of ambroid pressed amber | perlas de ambroína |
| mun.plan. | real pearl | perla fina |
| nat.res., fish.farm. | river pearl mussel | margaritana (Margaritana margaritifera) |
| fish.farm. | river pearl mussel | mejillón de agua dulce (Margaritifera margaritifera) |
| nat.res., fish.farm. | river pearl mussel | molusco perlífero (Margaritana margaritifera) |
| mun.plan. | set pearl | perla fina engastada |
| mun.plan. | solid imitation pearls | perlas artificiales macizas |
| mun.plan. | strung pearls | perlas finas enfiladas |
| food.ind. | tapioca in the form of pearls | tapioca en granos perlados |
| mun.plan. | three-quarter pearl | perla tres cuartos |
| mun.plan. | unworked pearl | perla fina en bruto |
| med. | vitreous body pearl | perla del cuerpo vítreo |
| mun.plan. | worked pearl | perla fina trabajada |
