"Kerauno-" is a Greek root word that means "thunderbolt" or "lightning." There are numerous synonyms for this word, such as "fulgur-" (from the Latin "fulgurare" meaning "to flash"), "bront-" (from the Greek "bronte" meaning "thunder"), and "astaph-" (from the Greek "astaphaios" meaning "flash of lightning"). Other synonyms for "kerauno-" include "tonitro-" (from the Latin "tonitrus" meaning "thunder"), "copro-" (from the Greek "kopros" meaning "dung" and used to describe the sound of thunder), and "aleko-" (from the Greek "alekto" meaning "unquenchable" and used to describe the burning brightness of lightning).