-um

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From the homographic case endings of the nominative, accusative, and vocative forms of numerous neuter Latin second declension nouns.

morpheme Denotes singular grammatical number.
morpheme Forms the ends of the names of certain elements (such as molybdenum and platinum).

Possibly from 'em.

morpheme Denotes transitive verbs in the trade pidgins used between English-speakers and indigenous populations; used derogatorily by extension in English by addition to any verb, transitive or not. Having finished her return of deaths, she went on to say "Black fellow sick—white lady fowl sendum—white lady kangaroo sendum—master all self eatum—" but here she paused and made an exception in favour of the matron, expressed by the words " Missis not eatum—missis good fellow."