Sea moss Zool. Any branched marine bryozoan resembling moss.
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  sea moss
       n 1: 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]
       2: any of various red algae having graceful rose to purple
          fronds (e.g. dulse or carrageen)