aitionn

juniper, Irish aiteann, Old Irish aitenn, Welsh aith, eithin, Cornish eythinen, Old Breton ethin (gl. rusco), *akto-, Indo-European root ak, sharp, Latin acidus, English acid, edge, Greek a$$'/kros, extreme, etc. The nearest words are Lithuanian ákstinas, sting, Church Slavonic ostinu. Also aiteal. *at-tenn-, "sharp bush or tree"; from root at, sharp, Early Irish aith, sharp, *atti-, atto-. For -tenn, see caorrunn. Cf. Irish teine, furze.