variant of :
combining form
indicating horn or a horny substance: keratin, keratogenous
indicating the cornea: keratoplasty

before vowels, kerat-, word-forming element meaning “horn, horny,” from Greek keras (genitive keratos) “horn,” from PIE *ker- (1) “horn, head” (see horn (n.)).

kerato- or kerat- or cerato- or cerat-


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  • Keratoacanthoma

    keratoacanthoma ker·a·to·ac·an·tho·ma (kěr’ə-tō-āk’ən-thō’mə) n. A rapidly growing skin tumor having a central keratin mass and usually occurring on exposed areas, invading the dermis but remaining localized and usually healing spontaneously.

  • Keratocele

    keratocele ker·a·to·cele (kěr’ə-tō-sēl’) n. A herniation of Descemet’s membrane through a defect in the outer layer of the cornea.

  • Keratoconjunctivitis

    [ker-uh-toh-kuh n-juhngk-tuh-vahy-tis] /ˌkɛr ə toʊ kənˌdʒʌŋk təˈvaɪ tɪs/ noun, Ophthalmology. 1. inflammation of the cornea and conjunctiva. keratoconjunctivitis ker·a·to·con·junc·ti·vi·tis (kěr’ə-tō-kən-jŭngk’tə-vī’tĭs) n. Inflammation of the cornea and conjunctiva resulting from hypersensitivity of corneal and conjunctival epithelium to an endogenous toxin.

  • Keratoconjunctivitis sicca

    keratoconjunctivitis sicca keratoconjunctivitis sic·ca (sĭk’ə) n. Keratoconjunctivitis characterized by decreased tear flow and thickening and hardening of the cornea and conjunctiva. Also called dry-eye syndrome.

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