American Heritage® Dictionary of the English Language, Fourth Edition
- n. The concave underside of the body of a jellyfish.
Century Dictionary and Cyclopedia
- n. The internal ventral or oral disk of a hydrozoan, as a jellyfish; the muscular layer beneath the umbrella or swimming-bell of a hydromedusan, continuous with the velum. If such an acaleph is likened to a woman's parasol, lined, then the lining is the subumbrella, the covering being the umbrella. Compare cut under
GNU Webster's 1913
- n. (Zoöl.) The integument of the under surface of the bell, or disk-shaped body, of a jellyfish.
- sub- + umbrella (Wiktionary)
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