1. Veil-like membrane; soft palate.
2. An annular membrane projecting inward from the margin of the umbrella in some jellyfishes (as the hydromedusae)
3. A swimming organ that is especially well developed in the later larval stages of many marine gastropods
Opna, nežna koža, kožica; fiz. elastična pločica za prenošenje zvučnih treptaja gotovo bez promene.
Odbrana, uzimanje u odbranu.
Stora.