خَيْشُومٌ

The extreme, or most remote, [meaning innermost,] part of the nose: (S, Msb:) or the interior of the nose: (MA:) or the upper part of the interior of the nose: and the bone of the nose: (KL:) or the part that is above the نُخْرَة [which here seems to mean the end, or tip, or flexible part,] of the nose, of the bone thereof: and what is beneath this [is] of [the thin cartilages called] the خَشَارِم of the head: (M, K:) and the nose [altogether] (Msb, KL) is so called by some: (Msb:) the word is of the measure فَيْعُولٌ: (Msb, TA:) and its plural is خَيَاشِيم: (Msb:) which [also] signifies certain cartilages in the extreme [or inmost] part of the nose, between it and the brain: or certain ducts, (عُرُوق, [meaning, or including, the air-passages, see جُشَّةٌ, and نَخَرَ, &c.,]) in the interior (بَاطِن M, or بَطْن K) of the nose. (M, K.)

[Hence,] the plural signifies also (tropical:) Prominences, or projecting parts, of mountains. (JK, S, TA.)

And the singular, [as a coll. gen. n.,] Small, thin, black things, resembling flesh; and morbose nodes; upon a bone. (TA.)