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OPERAT'ICAL, a. Pertaining to the opera; a word used by musicians.
OP'ERATING, ppr. Acting; exerting agency or power; performing some manual act in...
OPERA'TION, n. [L. operatio.] 1. The act or process of operating; agency; the ex...
OP'ERATIVE, a. 1. Having the power of acting; exerting force, physical or moral;...
OP'ERATOR, n. 1. He or that which operates; he or that which produces an effect....
OPER'CULATE, OPER'CULATED, a. [L. operculatur, from operio, to cover.] In botany...
OPER'CULIFORM, a. [L. operculum, a lid, and form.] Having the form of a lid or c...
OPERO'SE, a. [L. operosus, from opera, operor.] Laborious; attended with labor; ...
OPERO'SENESS, n. the state of being laborious.
O'PETIDE, n. [ope and tide.] The ancient time of marriage, from Epiphany to Ash ...
OPHID'IAN, a. [Gr. a serpent.] Pertaining to serpents; designating an order of v...
OPHID'ION, n. [Gr. a serpent.] a fish of the anguilliform kind, resembling the c...
OPHIOLOG'IC, OPHIOLOG'ICAL, a. Pertaining to ophiology.
OPHIOL'OGIST, n. One versed in the natural history of serpents.
OPHIOL'OGY, n. [Gr. serpent, and discourse.] That part of natural history which ...
OPHIOM'ANCY, n. [Gr. a serpent, and divination.] In antiquity, the art of divini...