[mod. L., in sense 1 ad. Gr. τύλωσις formation of a callus (Galen), f. τύλος or τύλη: see TYLO- and -OSIS.]
1. Path. a. An inflammatory disease of the eyelids, characterized by thickening and hardening of their edges. b. An affection of the mucous membrane of the lips and mouth, characterized by whitish spots; leucoplacia. c. Callosity.
1890. in Billings, Med. Dict.
1899. Syd. Soc. Lex., T[ylosis] palmæ … callosity of the palm. T. plantæ..., a callosity occurring in the foot.
1899. Allbutt’s Syst. Med., VIII. 689. Tylosis is usually painless.
¶ 2. Bot. = TYLOSE.
Perh. an erron. use arising from the pl. tyloses being taken as Latin.
1876. J. H. Balfour, in Encycl. Brit., IV. 87/1. These portions appear as cells filling the interior of the vessel, and are described under the name of tylosis.
1899. in Syd. Soc. Lex.
1900. B. D. Jackson, Gloss. Bot. Terms, Tylose, Tylosis..., a cell intruding into a duct.
