unsaponifiable

adjective
un·​sa·​pon·​i·​fi·​able | \-sə-ˌpän-ə-ˈfī-ə-bəl \

Medical Definition of unsaponifiable 

: 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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