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Definition of: tylosis
(tī·lō′sis) noun plural ·ses (-sēz)
1. Bot. A bladderlike enlargement of a plant cell, intruding within the cavity of a vessel from the wall of a contiguous growing cell.
2. The formation of calluses, especially on the skin.
3. The callus so formed. [<Gk. tylōsis <tylos a lump, callus]
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