Rat-tailed \Rat"-tailed`\, a. (Zo["o]l.) Having a long, tapering tail like that of a rat. {Rat-tailed larva} (Zo["o]l.), the larva of a fly of the genus Eristalis. See {Eristalis}. {Rat-tailed serpent} (Zo["o]l.), the fer-de-lance. {Rat-tailed shrew} (Zo["o]l.), the musk shrew.