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[tahy-loh-sis] /taɪˈloʊ sɪs/
noun, plural tyloses
[tahy-loh-seez] /taɪˈloʊ siz/ (Show IPA).
a bubblelike formation in the cavity of tracheids or vessels in the wood of trees, consisting of protoplasm intruded from adjacent parenchyma cells.
Often, tylose [tahy-lohs, tahy-lohs] /ˈtaɪ loʊs, taɪˈloʊs/ (Show IPA).
Origin of tylosis
1875-80; < Greek týlōsis act of making callous, equivalent to tylō-, variant stem of tyloûn to make callous, hard, derivative of týlos callus, lump, knob + -sis -sis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for tylosis


(botany) a bladder-like outgrowth from certain cells in woody tissue that extends into and blocks adjacent conducting xylem cells
Word Origin
C19: from Greek tulōsis, from tulos knob or tulē callus + -osis
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tylosis in Medicine

tylosis ty·lo·sis (tī-lō'-sĭs)
n. pl. ty·lo·ses (-sēz)

  1. Inflammation of the eyelids, characterized by thickening and hardening of the edges.

  2. A thickening of the horny layer of the skin as a result of chronic pressure or friction.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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