an abbreviation or short representation of a chemical element; the symbols in the periodic table
Natural elements all have chemical symbols of one or two letters; some manmade elements have three-letter symbols.
noun, Medicine/Medical. 1. (def 2). [sim-puh-thek-tuh-mee] /ˌsɪm pəˈθɛk tə mi/ noun, plural sympathectomies. Medicine/Medical. 1. surgery that interrupts a nerve pathway of the or involuntary nervous system. 2. Also called chemical sympathectomy. a like interruption by chemical means. /ˌsɪmpəˈθɛktəmɪ/ noun (pl) -mies 1. the surgical excision or chemical destruction (chemical sympathectomy) of one or more […]
noun 1. a toilet that is not connected to sewage pipes but has a holding compartment where waste is chemically treated until disposal.
noun, Photography. 1. (def 4). [toh-ner] /ˈtoʊ nər/ noun 1. a person or thing that . 2. a highly concentrated organic pigment containing little or no inert matter. 3. a powder, either dry or dispersed in an organic liquid, used in xerography to produce the final image. 4. Also called chemical toner. Photography, Movies. a […]
noun 1. warfare with asphyxiating, poisonous, or corrosive gases, oil flames, etc. noun 1. warfare in which chemicals other than explosives are used as weapons, esp warfare using asphyxiating or nerve gases, poisons, defoliants, etc The use of chemical agents as a weapon of war or terror. From the mustard gas used in World War […]