The plant yellowwort.

plural of yellow centaury

(UK, informal) cowardly behaviour

plural of yellow streak

A bird, the yellowhammer.

(medicine) melena or black jaundice in infants

A yellow ochre sometimes used as a pigment.

plural of yellow bunting

Used other than figuratively or idiomatically: Having yellow skin. / (chiefly derogatory, offensive) Of Far East Asian descent.

(transportation engineering) A condition in which a traffic signal or signals display a yellow light facing traffic in one direction and a green light facing traffic in the opposite direction at the same intersection. This is considered a poor design because it may give drivers facing the yellow light the false belief that it is safe to turn in front of opposing traffic that has the green light.