scaly (adj.)

[one of the skin plates on fish or snakes] c. 1300, from Old French escale "cup, scale, shell pod, husk" (12c., Modern French écale), from Frankish *skala or some other Germanic source, from Proto-Germanic *skæla "to split, divide" (source also of Dutch schaal "a scale, husk," Old High German scala "shell," Gothic skalja "tile," Old English scealu "shell, husk"), from PIE root *skel- (1) "to cut." A prehistoric cognate of scale (n.2) "weighing instrument."

In reference to humans, as a condition of certain skin diseases, it is attested from late 14c. Extended in botany to coverings of leaf-buds, etc., by 1776. As what falls from one's eye when blindness ends (usually figurative), it echoes Acts ix:18 (Latin tanquam squamæ, Greek hosei lepides).

adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy). Adjectives such as hugy, vasty are artificial words that exist for the sake of poetical metrics.