Designating the colour of blood, a ruby, a ripe tomato, etc., and appearing in various shades at the longer-wavelength end of the visible…

Red-haired.

That has red or reddish hair.

Having hair of a yellowish-red colour; of hair, yellowish-red.

= red-haired, adj. Also figurative.

having an amber-coloured crown (in various senses of crown, n.); esp. having a crown of amber-coloured hair.

That has red or reddish hair; (esp. of a bird) having a red head; = red-headed, adj.

Of a person: having red hair; (of an animal) having a red head or a head with red markings. Cf. polled, adj.2

That has hair the reddish colour of brick; red-haired. Cf. bricktop, n.