| n. | 1. | (Zool.) Any one of the acalephs, esp. one of the larger species, having a jellylike appearance. See Medusa and acaleph. |
| Noun | 1. | jellyfish - large siphonophore having a bladderlike float and stinging tentaclesSynonyms: Portuguese man-of-war, man-of-war |
| 2. | jellyfish - any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans |
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