| horopter | <optics> The line or surface in which are situated all the points which are seen single while the point of sight, or the adjustment of the eyes, remains unchanged. "The sum of all the points which are seen single, while the point of sight remains unchanged, is called the horopter." (J. Le Conte) Origin: Gr. Boundary + one who looks. Source: Websters Dictionary (01 Mar 1998) |
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| empirical | 1. Pertaining to, or founded upon, experiment or experience; depending upon the observation of phenomena; versed in experiments. "In philosophical language, the term empirical means simply what belongs to or is the product of experience or observation." (Sir W. Hamilton) "The village carpenter . . . Lays out his work by empirical rules learnt in his apprenticeship." (H. Spencer) 2. Depending upon experience or observation alone, without due regard to science and theory; said especially of medical practice, remedies, etc.; wanting in science and deep insight; as, empiric skill, remedies. Empirical formula. <chemistry> See Formula. Synonym: See Transcendental. Source: Websters Dictionary (01 Mar 1998) |
| empirical formula | In chemistry, a formula indicating the kind and number of atoms in the molecules of a substance, or its composition, but not the relation of the atoms to each other or the intimate structure of the molecule. Synonym: molecular formula. (05 Mar 2000) |
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