تَمَادَى فِى غَيِّهِ He persevered in his error. (Mṣb.)

مَدًى The utmost extent, term, limit, or reach, of a thing; syn. غَايَةٌ: (Ṣ, Mṣb, Ḳ:) an extent, a distance; a space, an interval; syn. مَسَافَةٌ. [meaning a space that is, or that is to be, traversed] and hence used in the sense before explained because extending to a غاية: (Z, in the Fáïk, quoted in the TA:) a goal. (The Lexicons passim.)

مُدْيَةٌ A butcher's knife. (Mgh.) See سِكِّينٌ.