Invertebrate Definition

ĭn-vûrtə-brĭt, -brāt
invertebrates
adjective
Not vertebrate; having no backbone, or spinal column.
Webster's New World
Of invertebrates.
Webster's New World
Having no moral backbone; lacking courage, resolution, etc.
Webster's New World
Synonyms:
Antonyms:
noun
invertebrates
Any animal without a backbone, or spinal column; any animal other than a fish, amphibian, reptile, bird, or mammal.
Webster's New World

An animal without vertebrae, i.e. backbone.

Wiktionary
Synonyms:

Other Word Forms of Invertebrate

Noun

Singular:
invertebrate
Plural:
invertebrates

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invertebrate