noun Pathology.
a condition in which the eyelashes grow inwardly.

1655–65; < Late Latin < Greek trichíāsis. See trich-, -iasis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trichiasis (trɪˈkaɪəsɪs)
1.  an abnormal position of the eyelashes that causes irritation when they rub against the eyeball
2.  the presence of hairlike filaments in the urine
[C17: via Late Latin from Greek trikhiasis, from thrix a hair + -iasis]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

trichiasis tri·chi·a·sis (trĭ-kī'ə-sĭs)
A condition in which the hair adjacent to a natural opening turns inward and causes irritation, as in the inward turning of the eyelashes upon the eye.

The American Heritage® Stedman's Medical Dictionary
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