PRONUNCIATION: (ahr-SEE-nee-uhs)

MEANING: adjective: Relating to or containing arsenic (especially when trivalent).

ETYMOLOGY: From Old French arsenic, from Latin arsenicum, from Greek arsenikon (yellow orpiment), from Arabic zarnik, from Persian zar (gold). Ultimately from the Indo-European root ghel- (to shine), which also gave us yellow, gold, glimmer, glimpse, glass, gloaming, melancholy, and choleric. Earliest documented use: 1818.

ARENIOUS - occurring in a place with seats all around so a lot of people can watch

ARSENIORS - the class that's going to graduate at the end of the year

ARSENIONUS - Mr Hall's burden