emissary

noun, plural em·is·sar·ies.

1. a representative sent on a mission or errand: emissaries to negotiate a peace.
2. an agent sent on a mission of a secret nature, as a spy.
3. Anatomy. sending or coming out, as certain veins that pass through the skull and connect the venous sinuses inside with the veins outside.
4. pertaining to an emissary.

adjective

5. Archaic. sent forth, as on a mission.

noun plural -saries

1. 1. an agent or messenger sent on a mission, esp one who represents a government or head of state
   2. (as modifier)an emissary delegation
2. an agent sent on a secret mission, as a spy

adjective

3. (of veins) draining blood from sinuses in the dura mater to veins outside the skull

n.

1. Any of various venous channels through the skull that connect the venous sinuses of the dura mater with veins external to the skull.