Meaning

noun a radioactive transuranic element produced by bombarding plutonium with neutrons

origin* As a north/Low German surname, from the archaic noun es, ehe (“swamp water”), possibly from a corruption of *ahu (“stream, river”). * As a Switzerland German/Alemannic German surname, from Ess (“pasture, grazing area”), from Proto-Germanic *atiska- (“grainfield”), possibly from Proto-Indo-European *h₂edos- (“sort of cereal, grain”), related to Latin ador (“spelt”), Hittite [script needed]…

Etymology from Wiktionary, CC BY-SA 3.0