life form

the form that is characteristic of a particular organism at maturity.
Also, life-form. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
life form
1.  biology the characteristic overall form and structure of a mature organism on the basis of which it can be classified
2.  any living creature
3.  (in science fiction) an alien

Collins English Dictionary - Complete & Unabridged 10th Edition
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