griseous

[gris-ee-uh s, griz-] /ˈgrɪs i əs, ˈgrɪz-/
adjective
1.
gray; pearl-gray.
Origin
1810-20; < Medieval Latin grīseus, based on Germanic *grīs or *grīsi gray, perhaps with suffix of Latin rūbeus; compare Old Saxon grîs gray Old French, French gris gray; see -eous
British Dictionary definitions for griseous

griseous

/ˈɡrɪsɪəs; ˈɡrɪz-/
adjective
1.
streaked or mixed with grey; somewhat grey
Word Origin
C19: from Medieval Latin griseus, of Germanic origin