uillinn, f. (gs. ~e, pl. ~eacha; gs. & gpl. -lleann used in certain phrases).1. Elbow. (a)In ~ a chéile, ~ ar ~, arm in arm. Ar ~ duine, at s.o.’s elbow. An ~ a thabhairt do dhuine, to elbow, nudge, s.o. Agus péire ~eacha uirthi, with her arms akimbo. S.a. alt11(a), cnámh 1(a), píb 1. (b) Elbow-shaped bend; corner, angle. ~ píopa, elbow of pipe. ~ ar bhóthar, sharp turn, elbow, in road. Iarann ~e, angle-iron. Bíomal ~e, angle-brace. 2. Mth: Angle. ~ istigh, interior angle. ~ airde, angle of elevation. ~ teagmhála, contact angle. ~ theorantach, limiting angle. (Ar) ~ seasca céim, (at an) angle of sixty degrees. S.a. seachtrach. (Var:gs. & npl. uilne, pl. uilneacha)