(n)a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease, Syn.inoculum
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
n. (Microbiology) The preparation of microorganisms which is inoculated{ 5 } into a growth medium; as, a small inoculum may not work well for the production phase of a fermentation. [ PJC ]