‖Tra′chy‐me‐du″sæ (?), n. pl. [NL., fr.Gr. � rough + medusa.] (Zoöl.) A division of acalephs in which the development is direct from the eggs, without a hydroid stage. Some of the species are parasitic on other medusæ.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.