poliosis
English
Etymology
From
Ancient Greek
πολῐός
(
polĭós
,
“
grey
”
)
+
-osis
.
Noun
poliosis
(
uncountable
)
The
decrease
or
absence
of
melanin
in
head
hair
,
eyebrows
, or
eyelashes
.
See also
Mallen streak