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Douglas Harper's Etymology Dictionary

im-

variant of in- before -b-, -m-, -p-, in the sense of "not, opposite of" (immobile, impersonal) as well as "in, into" (implant, impoverish). See in-. In some English words it alternates with em- (1).

Wiktionary

im-

Etymology 1 pre. (non-gloss definition: Expressing negation; not.) Etymology 2

pre. {{non-gloss definition|Alternative form of the prefix (term em- English), itself variant of (term en- English).}}

The Collaborative International Dictionary

Im-

Im- \Im-\ A form of the prefix in- not, and in- in. See In-. Im- also occurs in composition with some words not of Latin origin; as, imbank, imbitter.

Longman Dictionary of Contemporary English

im-

prefix
EXAMPLES FROM OTHER ENTRIES
▪ to implode