octave

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OCTAVE

Cardiology A clinical trial–Omapatrilat Cardiovascular Treatment Assessment Versus Enalapril
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

octave 

The interval between two frequencies having a ratio of two to one. Example: from 4 to 8 c/deg. Two octaves is a quadrupling of frequencies, and so on. Octaves are commonly used in specifying the bandwidth of the frequencies (e.g. spatial frequencies) to which cells in the visual pathway respond. See cycle per degree.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann