Definitions of zealot on the Web:
a member of an ancient Jewish sect in Judea in the first century who fought to the death against the Romans and who killed or persecuted Jews who collaborated with the Romans
partisan: a fervent and even militant proponent of something
wordnet.princeton.edu/perl/webwn
The term Zealot, in Hebrew kanai means one who is jealous on behalf of God. As a word in English it means anyone who is overly zealous. Specific uses in popular culture also exist.
en.wikipedia.org/wiki/Zealot
The Protoss are a race in Blizzard Entertainment's real-time strategy computer game, StarCraft. They are technologically advanced and rely on psionic abilities and cybernetics in battle. They are the primary opponents of the Zerg. The Protoss are highly religious and follow a strict code known as the Khala. The Protoss have a three-chambered heart (this was shown when Tassadar attacked the Zerg Overmind).
en.wikipedia.org/wiki/Zealot_(StarCraft)
— primary attack unit. The Zealot is a melee attacker, wielding a pair of psionic blades, and is much stronger than the primary attack units of the Zerg and Terran. Can be upgraded for faster movement speed. It is incapable of attacking air units.
www.nationmaster.com/encyclopedia/Protoss