in•ver•te•bratePronunciation: (in-vûr'tu-brit, -brāt"), [key]
not vertebrate; without a backbone.
of or pertaining to creatures without a backbone.
without strength of character.
an invertebrate animal.
a person who lacks strength of character.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.