first messenger
noun Biochemistry.
a hormone that triggers a biochemical reaction at a site removed from its release.
Compare
second messenger.
Origin of first messenger
First recorded in 1975–80
Words nearby first messenger
first law of thermodynamics,
first lieutenant,
first light,
first lord,
first mate,
first messenger,
first minister,
first molar,
first mortgage,
first mover,
first name