plural noun

Definition of Hemibranchii 

in some classifications

: a suborder of Thoracostei comprising fishes with an incomplete or reduced branchial apparatus and usually including the sticklebacks, cornetfishes, bellows fishes, and shrimpfishes

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History and Etymology for Hemibranchii

New Latin, from hemi- entry 1 + -branchii (from Latin branchia gill)

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