noun Biology.
injection performed under a microscope, especially of a solution or gene transplant into a cell or cell part.

1920–25; micro- + injection

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Medical Dictionary

microinjection mi·cro·in·jec·tion (mī'krō-ĭn-jěk'shən)
Injection of minute amounts of a substance into a microscopic structure, such as a single cell.

The American Heritage® Stedman's Medical Dictionary
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