exocrinology

noun
exo·cri·nol·o·gy | \ ˌek-sə-kri-ˈnäl-ə-jē, -ˌkrī-, -ˌkrē- \
plural exocrinologies

Medical Definition of exocrinology 

: the study of external secretions (as pheromones) that serve an integrative function

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