Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
aulax, ăcis, f., = αὖλαξ, a furrow, Veg. Art. Vet. 2, 28, 38; Aus. Ep. 10, 10 (old edd., aulix; the true form was restored by Schneider).