Xanthic vs. Xanthous — What's the Difference?

Of a yellowish colour.

Yellow.

Tending toward a yellow color, or to one of those colors, green being excepted, in which yellow is a constituent, as scarlet, orange, etc.

Yellow-brown; yolk-colored.

Possessing, imparting, or producing a yellow color; as, xanthic acid.

Pertaining to people with yellowish, red, auburn, or brown hair.

Yellow; specifically (Ethnol.), of or pertaining to those races of man which have yellowish, red, auburn, or brown hair.

Similar to the color of an egg yolk