reg'[=u]-la, n. a book of rules for a religious house: (archit.) one of the bands under a Doric triglyph or between the canals of the triglyphs:--pl. REG'ULÆ (-l[=e]). [L. regula, a rule.]
n. [Latin] A rule;- a book of rules or directions in monastic institutions;—in architecture, a fillet or listen; a regret.
