FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

zelos ζῆλος — dzay'-los — from 2204; properly, heat, i.e. (figuratively) "zeal" (in a favorable sense, ardor; in an unfavorable one, jealousy, as of a husband (figuratively, of God), or an enemy, malice):--emulation, envy(-ing), fervent mind, indignation, jealousy, zeal.

see GREEK for 2204