(n.) Any one of the acalephs, esp. one of the larger species, having a jellylike appearance. See Medusa.

Chilopoda Chordata Echiuroidea Ectoprocta Entoprocta Milquetoast Monoplacophora Nemertinea Phoronidea baby big baby chicken chicken liver coward crybaby doormat dull tool fence-sitter fraid-cat fraidy-cat funk funker gutless wonder invertebrate lightweight lily liver meek soul milksop mollycoddle mouse mugwump namby-pamby nebbish nonentity pansy pantywaist pushover sad sack scaredy-cat shilly-shally sissy softling softy sop waverer weak sister weakling white feather white liver wobbler