invertebrate

Lacking a backbone or spinal column; not vertebrate.

Of or relating to invertebrates.

An animal, such as an insect or mollusk, that lacks a backbone or spinal column.

Not vertebrate; having no backbone; specifically, of or pertaining to the Invertebrata. Also invertebral, invertebrated.

Figuratively, flaccid, as if from lack of a backbone; wanting strength, firmness, or consistency; weak; nerveless.

An invertebrated animal; any one of the Invertebrata.

Destitute of a backbone; having no vertebræ; of or pertaining to the Invertebrata.

See Age, and Silurian.

An animal without vertebrae, i.e. backbone.

Lacking a backbone.