- peroxysulphuric acid,
- perp walk,
Origin of perpendicular
Examples from the Web for perpendicular
Only those climbers who are absolutely at home aloft go forward down a perpendicular tree trunk.Wild Folk|Samuel Scoville
The Perpendicular church has been restored, and is of little interest.Wanderings in Wessex|Edric Holmes
Could I find a means of climbing up the perpendicular sides of my prison, if only a few feet?Jethou|E. R. Suffling
Thus the lower stages were of Perpendicular Gothic, the higher of Renaissance style.Highways and Byways in Cambridge and Ely|Rev. Edward Conybeare.
He had stooped with a frown: he returned to the perpendicular with a smile that was positively winning.The Adventures of Sally|P. G. Wodehouse
Word Origin for perpendicular
late 15c., from adverb (late 14c.), from Old French perpendiculer, from Latin perpendicularis "vertical, as a plumb line," from perpendiculum "plumb line," from perpendere "balance carefully," from per- "thoroughly" (see per) + pendere "to weigh, to hang" (see pendant). As a noun from 1570s. Related: Perpendicularly; perpendicularity.