intrinsic

Words with a similar base: intrinsic, intrinsical

'intrinsic'

[intrinsic.a.01] as in: belonging to a thing by its very nature; - John Dewey

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Examples:
form was treated as something intrinsic, as the very essence of the thing

'intrinsic'

[intrinsic.s.01] as in: situated within or belonging solely to the organ or body part on which it acts

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Examples:
intrinsic muscles