hydroecium
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infundibulum — n.; pl. ula [L. infundibulum, funnel] 1. A funnel shaped organ or part. 2. (CNIDARIA: Hydrozoa) The hydroecium. 3. (MOLLUSCA: Cephalopoda) An exhalant siphon leading out of the mantle cavity; infundibuliform adj … Dictionary of invertebrate zoology