arrowworm
— Noun
– English
~ any worm of the Chaetognatha; transparent marine worm with horizontal lateral and caudal fins and a row of movable curved spines at each side of the mouth
arse
— Noun
– English
~ the fleshy part of the human body that you sit on; "he deserves a good kick in the butt"; "are you going to sit on your fanny and do nothing?"
arsenal
— Noun
– English
~ a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms
arsenal
— Noun
– English
~ a place where arms are manufactured
arsenal
— Noun
– English
~ all the weapons and equipment that a country has
arsenate
— Noun
– English
~ a salt or ester of arsenic acid
arsenic
— Noun
– English
~ a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
arsenic acid
— Noun
– English
~ an acid formed from arsenic pentoxide
arsenic
— Noun
– English
~ 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
arsenical
— Noun
– English
~ a pesticide or drug containing arsenic
arsenide
— Noun
– English
~ a compound of arsenic with a more positive element
arsenopyrite
— Noun
– English
~ a silver-white or grey ore of arsenic
arsenous anhydride
— Noun
– English
~ a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer
arsine
— Noun
– English
~ a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare