1 adjective in or towards the southwestthiar theasthe southwestern part of the countryan chuid thiar theas den tír, iardheisceart na tírethe southwestern boundaryan teorainn thiar theasthey went in a southwestern directionchuaigh siad siar ó dheas2 adjective of the southwest(de chuid) an iardheiscirtthe southwestern dialectcanúint an iardheiscirt