quadrangul.um N 2 2 NOM S N
quadrangul.um N 2 2 VOC S N
quadrangul.um N 2 2 ACC S N
quadrangul.um N 2 2 GEN P N uncommon
quadrangulum, quadranguli N (2nd) N [DSXES] Late uncommon
quadrangle, plane figure having four sides;
quadrangul.um ADJ 1 1 NOM S N POS
quadrangul.um ADJ 1 1 VOC S N POS
quadrangul.um ADJ 1 1 ACC S M POS
quadrangul.um ADJ 1 1 ACC S N POS
quadrangulus, quadrangula, quadrangulum ADJ [XSXDO] lesser
quadrangular, having four sides;

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.