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The Collaborative International Dictionary
Acraspeda

Acraspeda \A*cras"pe*da\, n. pl. [NL., fr. Gr. 'a priv. + ? border.] (Zo["o]l.) A group of acalephs, including most of the larger jellyfishes; the Discophora.

Wiktionary
acraspeda

n. (context zoology English) A group of acalephs that includes most of the larger jellyfish