Noun medusan has 1 sense
  1. jellyfish, medusa, medusan - any of numerous usually marine and free-swimming coelenterates that constitute the sexually reproductive forms of hydrozoans and scyphozoans
    --1 is a kind of coelenterate, cnidarian
    --1 is a member of Cnidaria, phylum Cnidaria, Coelenterata, phylum Coelenterata
    --1 has particulars: Aegina; Chrysaora quinquecirrha
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