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n. 1. The third letter of the Greek alphabet. See Table at alphabet. 2. The third item in a series or system of classification. 3. A unit of magnetic intensity equal to one hundred thousandth (10-5) of an oersted. 4. A unit of mass equal to one millionth (10-6) of a gram. adj. Chemistry 1. Being in the third position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted. 2. Referring to the third of a group of isomers, or molecules of similar origin or properties, determined arbitrarily by those who discover or classify them. Used in combination. |
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