n (ár + cú, cf. We. aergi. St. fr. Táin Gloss. suggests two words, this and archú watchdog but see EIF 115 n. 82 ).

(a) war-hound, slaughter- hound (some exx. could belong to (b) infra): atá á.¤ (.i. cú doratad dar muir .i. cuilen brotcon) lem-sa . . . tri slabrada fair ┐ triar cacha slabraide. A hEspáin dosfucad, LU 5001 = archu, TBC-I¹ 512 ; á.¤ , TBC-LL¹ 1003 . oslaicther dún dond archoin, 1007 . is londbruth n-archon (árchon v.l.) cách tanic and, 5316 . imar glimnaig n-árchon hi fotha, LU 6463 (TBC). cethrar farchon fogharg, ZCP ii 144.31 . amail arcono ut canes rabidi , Aisl. Tond. vii 3 . archoin .i. coin dásachtacha, O'Cl. Fig. of a warrior: erig a árchu Emna, TBC-LL¹ 3977 . līnais Nia . . . slōgaib cach māirrīg ārchoin, Ält. Ir. Dicht. ii 18.y . cloicthech T. . . . do loscud lasin archoin cétna .i. la Tigernán, RC xviii 281.20 (Tig.).

(b) watch-dog(?): im archoin, Laws i 126.9 .i. cu araig, cu na tri ngnim .i. dingaib fer forrana, etc., 144.12 Comm. arcu anindli(?), v 250.4 .i. in cu bis ar in arach na ro hindledh re torba, 17 Comm. oc marbadh in arcon anraith, iii 466.27 Comm. archu anrath duine dire ┐ duine marbadh othrus lais acht beith a ngnimaibh techtaibh dingbail fir forrain, O'Curry 2513 ( Eg. 88, 42(43)b ). Meas Roida cétna tecoiscc árchona .i. coin áraigh .i. coin na trí ngním . . . .i. lorgairecht ┐ gabaltaige ┐ dingbáil fir forana, O'D. 985 ( H 3.17, 848 - 849 ); O'Curry 2514 ( Eg. 88, 42(43)b ). archu .i. cú bhios ceangailti, O'Cl. Cerberus archu iffirn, BB 417b38 . con-ogam .i. archu ar aicmi bethi, Auraic. 5741 .