Partisan /(pär"tĭ*zan)/

Par·ti·san

Partisan

n.
  1. An adherent to a party or faction; esp., one who is strongly and passionately devoted to a party or an interest.
    Both sides had their partisans in the colony.
    — Jefferson.
  2. The commander of a body of detached light troops engaged in making forays and harassing an enemy. (Mil.)

Partisan

a.
  1. Adherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party; as, blinded by partisan zeal.
  2. Serving as a partisan in a detached command; as, a partisan officer or corps. (Mil.)

Phrases & Compounds
Partisan ranger
a member of a partisan corps.

Partisan

n.
  1. A kind of halberd or pike; also, a truncheon; a staff.
    And make him with our pikes and partisans a grave.