air-

• er-, ir-
• aur- (before fo- or uss-)

From Proto-Celtic *ɸare-. Prefix form of ar (“in front of”).

air- (pretonic ar-)

1. for-, fore-

• Thurneysen, Rudolf (1940) [1909], D. A. Binchy and Osborn Bergin, transl., A Grammar of Old Irish, Dublin Institute for Advanced Studies, translation of Handbuch des Alt-Irischen (in German), →ISBN, § 823, pages 497–99; reprinted 2017