Webster's Revised Unabridged Dictionary · 1913

Emissary

Emissary , noun

[Latin emissarius, from emittere, emissum, to send out: compare French émissaire. See Emit.]

An agent employed to advance, in a covert manner, the interests of his employers; one sent out by any power that is at war with another, to create dissatisfaction among the people of the latter.
Buzzing emissaries fill the ears Of listening crowds with jealousies and fears. — Dryden

Emissary , adjective

1.
Exploring; spying. — B. Jonson
2.
(Anatomy) Applied to the veins which pass out of the cranium through apertures in its walls.