(n): any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
(n): any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions
(n): a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic
(n): (pharmacology) a medicine consisting of an extract in an alcohol solution
(n): a substance that destroys micro-organisms that carry disease without harming body tissues
I.