411 REFERENCE · Wiktionary
Perpendicular
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
perpendicular
English
Adjective
en architecture Of a style of English Gothic architecture from the fourteenth and fifteenth centuries, marked by stiff and rectilinear lines, mostly vertical window-tracery, depressed or four-centre arch, fan-tracery vaulting, and panelled walls.