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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 Trachymedusae
 硬水母類

From: Webster's Revised Unabridged Dictionary (1913)

 Tra·chy·me·du·sae n. pl.  Zool. 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 medusae.