Definition of middlemost in US English:

middlemost

adjective

  • That is in the very middle, or nearest the middle. Now chiefly with reference to position, age, or number (formerly also with reference to size, quality, etc.).

Origin

Late Middle English; earliest use found in Cursor Mundi: a Northumbrian poem of the 14th century. From middle + -most.

Pronunciation

middlemost

/ˈmɪdlməʊst/