Webster's Revised Unabridged Dictionary · 1913

Whortleberry

Whortleberry , noun

[Anglo-Saxon wyrtil a small shrub (dim. of wyrt wort) + English berry. See Wort, and compare Huckleberry, Hurtleberry.]

(a)
(Botany) In England, the fruit of Vaccinium Myrtillus; also, the plant itself. See Bilberry, 1.
(b)
(Botany) The fruit of several shrubby plants of the genus Gaylussacia; also, any one of these plants. See Huckleberry.