Regula
REGULA, the Latin word for a rule, hence particularly applied to the rules of a religious order (see MONASTICISM). In architecture the term is applied to a rule or square, the short fillet or rectangular block, under the taenia (q.v.) on the architrave of the Doric entablature.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
