noun, plural tyloses [tahy-loh-seez] . Botany.
a bubblelike formation in the cavity of tracheids or vessels in the wood of trees, consisting of protoplasm intruded from adjacent parenchyma cells.
Also, tylose.

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

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World English Dictionary
tylosis (taɪˈləʊsɪs)
botany a bladder-like outgrowth from certain cells in woody tissue that extends into and blocks adjacent conducting xylem cells
[C19: from Greek tulōsis, from tulos knob or tulē callus + -osis]

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American Heritage
Medical Dictionary

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.

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Example sentences
The pores of red oak are generally clear of tylosis, making the wood unusable for tight cooperage.
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