Pronunciation (US) SAMPA:/p3r.pEn.dI.ku.l3r/, SAMPA:/p3r.pEn.dI.ku.lAr/ (?) Noun perpendicular A line perpendicular to a given object or item. Translations Dutch: loodlijn Frisian: leadline Adjective perpendicular At a right angle from; At a 90 degree angle from. Ex. In most houses, the walls are perpendicular to the floor Antonym parallel Translations Dutch: loodrecht, haaks, perpendiculair French: perpendiculaire Frisian: leadrjocht German: rechtwinklig Hebrew: וינצב