formolize

transitive verb
for·​mol·​ize
variants: also British formolise \ -​ˌlīz \
also British -ed/-ing/-s

Definition of formolize 

: to treat (as a serum) with a dilute formaldehyde solution especially for the purpose of attenuating a virus or toxin

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History and Etymology for formolize

Formol + -ize

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