starfish

Any of various echinoderms (not in fact fish) with usually five arms, many of which eat bivalves or corals by everting their stomach.

(slang, disapproving) A woman (or, less commonly, a gay man) who reluctantly takes part in sexual intercourse, and lies on the back while spreading the limbs.

(slang, vulgar) The anus.

(no longer used) Any many-armed or tentacled sea invertebrate, whether cnidarian, echinoderm, or cephalopod.

To assume a splayed-out shape, like that of a starfish.

While floating on water

To form into a splayed-out shape, like that of a starfish.