• Webster's Revised Unabridged Dictionary
    • n Tylosis (Bot) An intrusion of one vegetable cell into the cavity of another, sometimes forming there an irregular mass of cells.
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Century Dictionary and Cyclopedia
    • n tylosis In botany, a growth formed in the cavity of a duct by the intrusion of the wall of a contiguous cell through one or more of the perforations of the duct.
    • n tylosis An affection of the eyelids characterized by an indurated thickening of their edges.
    • n tylosis Same as leucoplacia.
    • n tylosis Callosity.
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Chambers's Twentieth Century Dictionary
    • n Tylosis tī-lō′sis (bot.) a growth formed in the cavity of a duct by intrusion from a contiguous growing cell: an inflammation of the eyelids: callosity
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. ty`los a lump, knot
Chambers's Twentieth Century Dictionary