Falling out of hair

Wiktionary Word definitions in Wiktionary
n. The sound change by which Greek lost the consonant sound /h/ during antiquity.

WordNet Word definitions in WordNet
n. falling out of hair

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"loss of hair through disease," 1837, medical Latin, from Greek psilosis "a stripping of hair," from psiloun "to strip of hair," from psilos "bare" (see psilo- ).

Wikipedia Word definitions in Wikipedia
Psilosis is the sound change in which Greek lost the consonant sound /h/ during antiquity. The term comes from the Greek psílōsis ("smoothing, thinning out") and is related to the name of the smooth breathing (ψιλή psilḗ ), the sign for the absence of ...