branchia

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bran·chi·a

, pl.

bran·chi·ae

(brang'kē-ă, -ē), Do not confuse this word with brachium or its derivatives.
The gills, or organs of respiration, in water-living animals.
[G. gill]

branchia

(brăng′kē-ə)
n. pl. bran·chiae (-kē-ē)
A gill or similar organ of respiration.

branchia

An obsolete term for the respiratory organ of aquatic and semiaquatic animals for capturing O2 in water; gills.