Initialism of intramuscular.

Initialism of instant message (verb)

(computing) Initialism of information management. / (Internet) Initialism of instant message. / (Internet) Initialism of instant messaging. / (aviation) Initialism of inner marker.

Alternative form of the prefix em-, itself variant of en-.

(astronomy) irregular galaxy with no coherent structure

Expressing negation; not.

(colloquial, chiefly Scotland) Representing a pronunciation of him that drops the h.

simple past tense and past participle of IM

present participle of IM

plural of Im