Opisthion

O*pis"thi*on

(?), n. [NL., fr. Gr. hinder.] (Anat.) The middle of the posterior, or dorsal, margin of the great foramen of the skull.
[1913 Webster]

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O*pis`tho*bran"chi*a

(?),

O*pis`tho*bran`chi*a"ta

(?), } n. pl. [NL., from Gr. 'o`pisqen behind + gills.] (Zol.) A division of gastropod Mollusca, in which the breathing organs are usually situated behind the heart. It includes the tectibranchs and nudibranchs.
[1913 Webster]

 

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Fri 14th December 2018