any of various bony fishes of the subclass Actinopterygii, having strong slender rays, excluding the coelacanth and lungfish.
Any of various bony fishes belonging to the subclass Actinopterygii, having fins supported by thin bony rays. Ray-finned fish evolved in the early Devonian Period and include most species of fish today. Also called actinopterygian. Compare lobe-finned fish.
noun, Botany. 1. one of the marginal florets surrounding the disk of tubular florets in the flower heads of certain composite plants, as the daisy. ray flower One of the narrow flowers, resembling single petals, that surround the central disk in the capitulum or flower cluster of a plant of the composite family (Asteraceae or […]
noun 1. a gun that can fire bursts of usually destructive or lethal rays: a science fiction novel whose hero has a ray gun made of gold. 2. a child’s futuristic toy gun that emits sparks, whirring noises, etc. noun 1. (in science fiction) a gun that emits rays to paralyse, stun, or destroy
[rey-lee] /ˈreɪ li/ noun 1. John William Strutt [struht] /strʌt/ (Show IPA), 3rd Baron, 1842–1919, English physicist: Nobel prize 1904. /ˈreɪlɪ/ noun 1. Lord, title of John William Strutt, 1842–1919, British physicist. He discovered argon (1894) with Ramsay and made important contributions to the theory of sound, the theory of scattering of radiation, etc. Nobel […]
- Rayleigh disc
noun 1. a small light disc suspended in the path of a sound wave, used to measure the intensity of the sound by analysing the resulting deflection of the disc