OPIPAROUS O*pip"a*rous, a. Etym: [L. opiparus, fr. ops, opis, riches + parare to provide.]
Defn: Sumptuous. [Obs.] — O*pip"a*rous*ly, adv. [Obs.] E.
Waterhouse.
OPISOMETER
Op`i*som"e*ter, n. Etym: [Gr. -meter.]
Defn: An instrument with a revolving wheel for measuring a curved line, as on a map.
OPISTHION
O*pis"thi*on, n. Etym: [NL., fr. Gr. (Anat.)
Defn: The middle of the posterior, or dorsal, margin of the great foramen of the skull.
OPISTHOBRANCHIA; OPISTHOBRANCHIATA O*pis`tho*bran"chi*a, O*pis`tho*bran`chi*a"ta, n. pl. Etym: [NL., from Gr. (Zoöl.)
Defn: A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
OPISTHOBRANCHIATE
O*pis`tho*bran"chi*ate, a. (Zoöl.)
Defn: Of or pertaining to the Opisthobranchiata.
— n.