Willow gall

(Zool.) a conical, scaly gall produced on willows by the larva of a small dipterous fly (Cecidomyia strobiloides).

See also: Willow

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
(You can see the young insect here, in the cut-open willow gall above.) Like a gingerbread house, the gall gives the growing insect a place to live and something to eat at the same time.