guir

Verbs ending in _guir_ and _quir_ change the _gu_ into = g = and the _qu_ into = c = before _a_ or _o_, as --

Pitman's Commercial Spanish Grammar (2nd ed.) C. A. Toledano

Bibed hinny, val i vinno; gan vod guir diame ran oi batkaniad; ni J amgcn na mined Britin'cd o'r Iny) - ima i Ltdau; a Kin vod Guyr Guafguyn m arvery Kimiykiaic o Fremg a piu hen laic araA, mi a dibiey nad over isun nag amhercnayol, edr_, x uidig yu hiair.

Archaeologia Britannica, giving some account additional to what has been hitherto publish'd, of the languages, histories and customs of the original inhabitants of Great Britain: : from collections and observations in travels through Wales, Cornwal, Bas-Bretagne, Ireland and Scotland. 1707