اتو

أَتْوَانُ ذ a corroborative [or imitative sequent] of أَسْوَانُ, which signifies grieving mourning, or sorrowful: (TA:) or i. q. حَرِيصٌ [ vehemently desirous; eager; &c.]. (Mirkát el-Loghah, cited by Golius.)