https://en.wikipedia.org/wiki/Inoculum
In biology, inoculum refers to the source material used for inoculation.Inoculum may refer to: . In medicine, material that is the source of the inoculation in a vaccine; In microbiology, propagules: cells, tissue, or viruses that are used to inoculate a new culture Microbial inoculant, the beneficial introduction of microbes to improve plant health; A method of propagation of fungal plant ...