| twilight | 1. The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18 deg below the horizon, occasioned by the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth. 2. Faint light; a dubious or uncertain medium through which anything is viewed. "As when the sun . . . From behind the moon, In dim eclipse. Disastrous twilight sheds." (Milton) "The twilight of probability." (Locke) Origin: OE. Twilight, AS. Twi- (see Twice) + leoht light; hence the sense of doubtful or half light; cf. LG. Twelecht, G. Zwielicht. See Light. Source: Websters Dictionary (01 Mar 1998) |
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| twilight sleep | Formerly a method of producing sleep for delivery by a combination of morphine and scopolamine. (05 Mar 2000) |
| twilight state | A condition of disordered consciousness during which actions may be performed without the conscious volition of the individual and with no memory of such actions. Compare: somnambulic epilepsy. (05 Mar 2000) |
| twilight vision | Vision when the eye is dark-adapted. See: dark adaptation, dark-adapted eye. Synonym: night vision, rod vision, scotopia, twilight vision. (05 Mar 2000) |