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From Biology-Online Dictionary
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noun, plural

(1) Cells used in an inoculation, such as cells added to start a culture.

(2) A biological material (like a virus or toxin or immune serum) that is injected into a human to induce or increase immunity to a particular disease.


Word origin: New Latin, from Latin inoculāre, to graft a scion.

Synonym: inoculum.
See also: inoculation.