athrú, m. (gs. -raithe, pl. -ruithe). 1. vn. of athraigh1. 2. Change, alteration. ~ a chur, a dhéanamh, ar rud, to make an alteration in sth. Teacht ar ~ tuairime, to come to a different opinion. Tháinig ~ mór ort le bliain, you have greatly altered in the past year. ~ intinne, change of mind. ~ gné, cló, transfiguration. ~ crutha, deilbhe, transformation. 3. Variation. ~ maighnéadach, magnetic variation. ~ an chompáis, variation of the compass. 4. Mth: Reduction. (Var:áthrú)