Definition of -most in English:

-most

suffix

Forming superlative adjectives and adverbs from prepositions and other words indicating relative position: innermost uppermost

Origin

Old English -mest, assimilated to most.

Definition of -most in:

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Word of the day iconoclasm
Pronunciation: ʌɪˈkɒnəklaz(ə)m
noun
attacking or rejecting cherished beliefs or established values...