[sem-ee-sin-thet-ik, sem-ahy-] /ˌsɛm i sɪnˈθɛt ɪk, ˌsɛm aɪ-/
adjective, Chemistry.
derived synthetically from one or more substances of natural origin.

semisynthetic sem·i·syn·thet·ic (sěm’ē-sĭn-thět’ĭk, sěm’ī-)

Prepared by chemical synthesis from natural materials, as of a pharmaceutical.

Consisting of a mixture of natural and synthetic substances.

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