unsaponifiable
adjective
un·sa·pon·i·fi·able
-sə-ˌpän-ə-ˈfī-ə-bəl
: incapable of being saponified
—used especially of the portion of oils and fats other than the glycerides
unsaponifiable fractions such as steroids or vitamin A
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Merriam-Webster unabridged
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