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OPERO'SENESS, n. the state of being laborious.
OPERO'SE, a. [L. operosus, from opera, operor.] Laborious; attended with labor; ...
OPER'CULIFORM, a. [L. operculum, a lid, and form.] Having the form of a lid or c...
OPER'CULATE, OPER'CULATED, a. [L. operculatur, from operio, to cover.] In botany...
OP'ERATOR, n. 1. He or that which operates; he or that which produces an effect....
OP'ERATIVE, a. 1. Having the power of acting; exerting force, physical or moral;...
OPERA'TION, n. [L. operatio.] 1. The act or process of operating; agency; the ex...
OP'ERATING, ppr. Acting; exerting agency or power; performing some manual act in...
OPERAT'ICAL, a. Pertaining to the opera; a word used by musicians.
OP'ERATE, v.i. [L. operor; Heb. signifies to be strong, to prevail.] 1. To act; ...
OP'ERANT, a. [See Operate .] Having power to produce an effect. [Not used. We no...
OP'ERABLE, a. Practicable. [Not used.]
OP'ERA, n. [L. opera, work, labor.] A dramatic composition set to music and sung...
OPENNESS, n. o'pnness. 1. Freedom from covering or obstruction; as the openness ...
OPENMOUTHED, a. o'pnmouthed. Greedy; ravenous; clamorous; as an open-mouthed lion.
OPENLY, adv. o'pnly. 1. Publicly; not in private; without secrecy; as, to avow o...