/airt/ ; Scot. /ayrddt/ , Chiefly Scot.
n.
1. a direction.
v.t.
2. to point out the way; direct; guide.
Also, airth /airth/ ; Scot. /ayrddth/ .
[ 1400-50; late ME (Scots) a ( i )rt àird point, quarter of the compass; c. Gk árdis arrowhead. The borrowing of Scots airt from ScotGael àird is exact since ScotGael d is totally voiceless and àird sounds like E arch ]