preincubate

transitive verb
pre·​in·​cu·​bate | \ -ˈiŋ-kyə-ˌbāt, -ˈin- How to pronounce preincubate (audio) \
preincubated; preincubating

Medical Definition of preincubate

: to incubate (as a cell or a culture) prior to a treatment or process red cells were preincubated with cholinergic ligands— D. P. Richman et al