That which is inmost; the inmost part. literal and figurative. (Rarely in plural.)

The highest part or point of something; the top, summit. rare after 17th cent.

figurative. A deep (i.e. secret, mysterious, unfathomable, etc.) region of thought, feeling, or being; the inmost, remotest, or extreme part. Now…

figurative. The inmost part or member. Obsolete. rare.

The deepest, inmost, or most remote part, esp. of a recess, bay, etc.

The innermost part of something; spec. the sanctuary of a temple; = penetralium, n.

figurative. A deep (i.e. secret, mysterious, unfathomable, or vast) region of thought, feeling, or being; a ‘depth’, ‘abyss’. poetic and rhetorical.

Any one of the most remote or innermost parts or corners of a thing; a hidden place. With reference to a building, natural feature, etc…

Perhaps: = recess, n. 6b.

n. The inmost part.

(elliptical for ‘inmost part’, ‘intrinsic value’, ‘intrinsic quality’: see A. 3)

The innermost parts or recesses of a building; spec. the sanctuary or inner sanctum of a temple. Also figurative: secret parts, mysteries, etc.

That which is innermost; the inmost part.