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H/D
abbr., auto.	heater/defroster
abbr., avia.	height to diameter
abbr., oil	hold down
H&D
abbr., avia.	harden and grind
H.D.
abbr., avia., med.	hearing distance
abbr., econ.	heavy-duty
H&D
abbr., mil., avia.	hardened and dispersed
H-D
abbr., el.	Hurter-Driffield curve
h.d.
abbr.	hard drawn; heavy duty; high density
polym.	hard-drawn
h. d.
abbr., med.	at bedtime
abbr., med., lat.	hora decubitus
H & D
abbr.	hardened and dispersed
abbr., photo.	Hurter & Driffield
h/d
gen.	heavy duty (Joyo)

H: 12 phrases in 4 subjects

Abbreviation	8
Military	1
NASDAQ	2
United Kingdom	1