IPA: //ˌmaɪ.kroʊ.ɪnˈdʒɛk.tɪŋ//
KK: /maɪkroʊɪnˈdʒɛktɪŋ/
The process of injecting small amounts of a substance into a cell or organism using a fine needle or pipette.
Microinjecting allows scientists to introduce DNA directly into cells for research purposes.
Microinjecting → It is formed from "micro-" (from Greek "mikros", meaning small) and "injecting" (from Latin "iniectio", meaning to throw in). The word describes the act of throwing in or introducing something small, typically a substance, into a cell or organism.
Think of 'small' ('micro-') being 'thrown in' ('injecting') — that's what microinjecting means.
No commonly confused words.