n. The active material used in an inoculation; an inoculant
the GNU version of the Collaborative International Dictionary of English
n. The preparation of microorganisms which is inoculated{5} into a growth medium.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
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
Word Usage
"The researchers took an inoculum from the hypersaline, alkaline Mono lake and grew it in serial dilutions so that the medium contained progressively increasing amounts of arsenic (As) substituting for phosphorus (P)."