n n, f. O.Ir. derucc. dearca f., IGT Decl. § 6 . See Jn. Celt. Stud. ii 25 . acorn: glandis isin latin .i. dircu, Corm. Y 167 . dercain .i. dair-chnú, 453 . fuath dercon, ib. derucc gl. glans, Sg. 113b9 . amál chócúll dercon nó chno, Thes. i 5.38 . d.¤ ┐ uball ┐ cnu, Dinds. 34 ( RC xv 419.19 ). intan tuitis in d.¤ dheidhinach dhe, is ann tic blath na dercon tanaise fair, Anecd. ii 2.17 . oendircu a ccind na cuslindi ┐ oendircu i mmullach na darach ina re, LL 126b10 . pl. derccain duba a ssithchailtib, LL 118a14 ( Ériu vii 2.12 ). dercoin, BS 130.22 (§ 68) . dercoinn (: choill), 110.6 (§ 54) . dercna, K. and H. 19 . do dercnaibh darach, AU i 563 n. 8 . a thorud de dircnaib, RC xvi 278.16 .

n gentilic appellation, feminine equivalent of maccu (see Éigse xxviii 42-70 ): da mac Cuimne Derco Cuind (sic leg.) ingine Echach Tirmcharna, Anecd. iii 61.23 . Hūi Dercco Céin, Corp. Gen. 155 (Rawl. 143 b 8) .