(ˌ) ̷ ̷ˌ ̷ ̷ ̷ ̷ˈä.trəpə̇n noun
( -s )
Etymology: International Scientific Vocabulary bacteri- + -trope + -in; originally formed in German
: any of certain constituents (probably antibodies) of serum that unite with bacteria and make them more susceptible to phagocytosis