a combining form of most occurring in a series of superlatives: foremost; utmost.
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British Dictionary definitions for -most
forming the superlative degree of some adjectives and adverbshindmost; uppermost
Word Origin for -most
Old English -mǣst, -mest, originally a superlative suffix, later mistakenly taken as derived from mǣst (adv) most
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for -most
superlative suffix of adjectives and adverbs, from Old English -mest (altered in Middle English by influence of most), a double superlative, from -mo, -ma (cf. Old English forma "first," meduma "midmost"), cognate with Latin -mus, + -est.
Online Etymology Dictionary, © 2010 Douglas Harper