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Longman Dictionary of Contemporary English
im-
prefix
EXAMPLES FROM OTHER ENTRIES
▪ to implode
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.

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).}}