تَحْتَانِىٌّ

[Of, or relating to, the location that is beneath, below, or under; inferior; lower;] rel. n. of تَحْت, like as فَوْقَانِىٌّ is of فَوْق: ا and ن being very often added in the rel. n. (TA.) [تُحَيْت diminutive of تَحْت, q. v.]