| benign positional vertigo | Brief attacks of paroxysmal vertigo and nystagmus that occur solely with certain head movements or positions, e.g., with neck extension; due to labyrinthine dysfunction. Synonym: positional vertigo of Barany, postural vertigo. (05 Mar 2000) |
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| positional | Of or pertaining to position. "Ascribing unto plants positional operations." (Sir T. Browne) Source: Websters Dictionary (01 Mar 1998) |
| positional cloning | Cloning a gene based simply on knowing its position in the genome without any idea of the function of that gene. Because this is the reverse of how things have been traditionally done, it has also been called reverse genetics. (12 Dec 1998) |
| positional information | The instructions that are interpreted by cells to determine their differentiation in respect of their position relative to other parts of the organism, for example digit formation in the limb bud of vertebrates. (18 Nov 1997) |
| positional nystagmus | Nystagmus occurring only when the head is in a particular position. (05 Mar 2000) |
| positional probability | <chemistry> A type of probability that depends on the number of arrangements in space that yield a particular state. (09 Jan 1998) |
| positional vertigo of Barany | Brief attacks of paroxysmal vertigo and nystagmus that occur solely with certain head movements or positions, e.g., with neck extension; due to labyrinthine dysfunction. Synonym: positional vertigo of Barany, postural vertigo. (05 Mar 2000) |