The Collaborative International Dictionary
Sea moss
Sea moss \Sea" moss`\ (?; 115). (Zo["o]l.) Any branched marine bryozoan resembling moss.
Wiktionary
sea moss
n. Any branched marine bryozoan resembling moss.
WordNet
sea moss
n. sessile aquatic animal forming mosslike colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding [syn: bryozoan, polyzoan, sea mat, moss animal]
any of various red algae having graceful rose to purple fronds (e.g. dulse or carrageen)
Usage examples of "sea moss".
It was probably almost beneath the surface at high tide, Griff judged by the lengths of vivid yellow sea moss that clung to it in ragged patches.