candēla

Latin candela derived from candēre, 'to shine, to glow white-hot.' The Romans used candela for a tallow-dipped rush light, the cheapest form of portable illumination available to ordinary citizens. A candelabrum was a stand for holding multiple candelae—the plural candelabra eventually became the English singular, a grammatical shift that would have bewildered a Roman schoolmaster.

The candelabrum was a fixture of Roman domestic life. Wealthy households had elaborate bronze and silver candelabra in their triclinia. The seven-branched menorah of the Jerusalem Temple, which Roman soldiers carried off as plunder in 70 CE and depicted on the Arch of Titus, is essentially a ritual candelabrum. Light-holders have been sacred objects across cultures for as long as fire has been portable.

In 1789, during the storming of the Bastille, Parisian revolutionaries repurposed aristocratic candelabra as both weapons and symbols. The ornate lighting fixtures of the ancien regime became trophies of the people. Later, crystal chandeliers and candelabra became markers of the new bourgeois class that replaced the aristocracy—the same objects, the same light, different owners.

In 1948, the candela was adopted as the SI base unit of luminous intensity, directly honoring the Latin word. It is defined not by wax and wick but by the radiation emitted at a specific frequency of light. The word that began with a sputtering tallow rush now measures the output of lasers and LEDs. Candela still means 'to shine'—it has simply moved from the dining room to the physics laboratory.