German ⇄ Bulgarian Czech Danish Dutch English Finnish French Greek Italian Polish Portuguese Romanian Russian Spanish Swedish

Nullinie f
gen.	nought; zero
amer.	naught
construct.	neutral fiber
meas.inst.	datum line
mech.	gage line; gauge line
phys.	central line; elastic line; light line; neutral filament; null line; origin of the band
tech.	neutral axis; neutral line; zero line; reference line
transp., nautic., fish.farm.	base line; baseline

Nullinie: 3 phrases in 2 subjects

Astronomy	1
Optics branch of physics	2