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Definition of: invertebrate
(in·vûr′tə·brit, -brāt) adjective
1. Destitute of a backbone; not vertebrate.
2. Of or pertaining to the Invertebrata.
3. Lacking force or firmness; irresolute: also in·ver′te·bral.
—noun
1. An invertebrate animal; one of the Invertebrata.
2. One who lacks resolution.
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