In"most` (?), a. [OE. innemest, AS. innemest, a double superlative form fr. inne within, fr. in in. The modern form is due to confusion with most. See In, and cf. Aftermost, Foremost, Innermost.]
Deepest within; farthest from the surface or external part; innermost.
And pierce the inmost center of the earth.
Shak.
The silent, slow, consuming fires,
Which on my inmost vitals prey.
Addison.
© Webster 1913.