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Webster 1913 Edition

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Noun.

pl.

[NL., fr. Gr.

ὕδωρ

water + [GREEK] gills.]

(Zool.)

An extensive artificial division of gastropod mollusks, including those that breathe by gills, as contrasted with the Pulmonifera.

–

Hyˊdro-bran′chi-ate

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Adj.