sea hare noun1 •Any member of the order Aplysiamorpha or Anaspidea, large marine gastropod molluscs with a soft internal shell made of protein.Pliny saith that there are certaine Seahares in India that to us are poison, and we bane to them; so that we die if we but touch them; now whether is man or the Sea-hare poison? — 1603 formssea hares
