pirilampo

According to Raphael Bluteau’s 1712–1728 Vocabulario Portuguez e Latino, coined in 1696 during a meeting in the 4th count of Ericeira’s bookstore, as an alternative to the vulgar caga-lume. While Bluteau reports the coinage was inspired by Latin lampyris, from Ancient Greek λαμπυρίς (lampurís), modern dictionaries instead derive the word as a learned borrowing from Ancient Greek πυριλαμπής (purilampḗs, “bright with fire”).