babylon — the chief city of ancient Mesopotamia: first settled around 3000 bc
celadon — a type of porcelain having a greyish-green glaze: mainly Chinese
echelon — a level of command, authority, or rank: After years of service, she is now in the upper echelon of city officials. Synonyms: place, rank, hierarchy, authority, grade, office; row, tier, rung; social standing, position, class, standing.
hexagon — a polygon having six angles and six sides.
negatron — Also called negatron. Physics, Chemistry. an elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10 −19 coulombs, a mass of 9.108 × 10 −31 kilograms, and spin of ½, and existing independently or as the component outside the nucleus of an atom.
telethon — a television broadcast lasting several hours, especially one soliciting support for a charity.
