mace (n.1) Look up mace at
"heavy metal weapon, often with a spiked head," late 13c., from Old French mace "a club, scepter" (Modern French masse), from Vulgar Latin *mattea (source also of Italian mazza, Spanish maza "mace"), from Latin mateola (in Late Latin also matteola) "a kind of mallet." The Latin word perhaps is cognate with Sanskrit matyam "harrow, club," Old Church Slavonic motyka "mattock," Old High German medela "plow" [Klein]. As a symbol of authority or office from mid-15c.
mace (n.2) Look up mace at
"spice made from dry outer husk of nutmeg," late 14c., from Old French macis (in English taken as a plural and stripped of its -s), of uncertain origin, sometimes said to be a scribal error for Latin macir, the name of a red spicy bark from India, but OED finds this etymology unlikely.
Mace (n.3) Look up Mace at
chemical spray originally used in riot control, 1966, technically Chemical Mace, a proprietary name (General Ordnance Equipment Corp, Pittsburgh, Pa.), probably so called for its use as a weapon, in reference to mace (1). The verb is first attested 1968. Related: Maced; macing.