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Webster 1913 Edition

Hydrozoa

‖

Hyˊdro-zo′a

,

Noun.

pl.

[NL., fr. E.

hydra

+ Gr.

ζῶ,ον

an animal.]

(Zool.)

The Acalephæ; one of the classes of cœlenterates, including the Hydroidea, Discophora, and Siphonophora.