15-letter words containing u, n, d, y
- uropygial gland — a gland opening on the back at the base of the tail in most birds that secretes an oily fluid used by the bird in preening its feathers.
- video frequency — transmission frequency of the television picture.
- young pretender — a member of the royal family that ruled in Scotland from 1371 to 1714 and in England from 1603 to 1714.
- young's modulus — a coefficient of elasticity of a substance, expressing the ratio between a stress that acts to change the length of a body and the fractional change in length caused by this force.