مَسَاحٌ

or مَسَاحَةٌ, the latter of the measure مَفْعَلَةٌ, from السِّيَاحَةُ, [each apparently meaning (assumed tropical:) A place of سِيَاحَة, or journeying,] is singular of مَسَايِحُ, in which the ى is like that in مَعَايِشُ, as in other similar words of which the medial radical is an infirm letter, except مَصَايءِبُ, by rule مَصَاوِبُ. (Har p. 15.)

[The plural مَسَايِحُ is also explained by Freytag as applied in the Deewán of Jereer to (assumed tropical:) The part of the head between the temples as far as the forehead (where the hairs are).]