as

(noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and various alloys; found in arsenopyrite and orpiment and realgar. Synonyms: arsenic, As, atomic number 33.

(noun) a United States territory on the eastern part of the island of Samoa. Synonyms: American Samoa, Eastern Samoa, AS.

(adv) to the same degree (often followed by `as'). Synonyms: equally, every bit. Examples: "They were equally beautiful." "Birds were singing and the child sang as sweetly." "Sang as sweetly as a nightingale." "He is every bit as mean as she is."