dair1, f. (gs. & gpl. darach, npl. daracha). 1. Oak. ~ choiteann, neamhghasánach, thoilm, pedunculate, sessile, holm, oak. Crann darach, oak-tree. Clár darach, oak-board. Dul idir an craiceann is an ~, to interfere in family affairs. S.a. snag21. 2. Letter D in ogham alphabet.