Each of the lines in which light (and heat) may seem to stream from the sun or any luminous body, or pass through a small opening
A broad flat marine or freshwater fish with a cartilaginous skeleton, wing-like pectoral fins, and a long slender tail. Many rays have venomous spines or electric organs
(In tonic sol-fa) the second note of a major scale
To clean (grain, pulses, etc.) using a sieve, especially by sifting in a circular motion so that the chaff, etc. collects in the centre. Compare ree. Also without object: to sieve in this way.
(1627–1705), English naturalist. Ray was the first to classify flowering plants into monocotyledons and dicotyledons, and he established the species as the basic taxonomic unit. His systematic scheme was not improved upon until that of Linnaeus
(1890–1976), American photographer, painter, and film-maker; born Emmanuel Rudnitsky. A leading figure in the Dada and surrealist movements, he is known for his photographs in which images were manipulated and superimposed on one another
(1921–92), Indian film director, the first to bring Indian films to the attention of Western audiences. Notable films: Pather Panchali (1955)
A system of naming the notes of the scale (usually doh, ray, me, fah, soh, lah, te) used especially to teach singing, with doh as the keynote of all major keys and lah as the keynote of all minor keys
misty rays of light shone through the trees
An electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials opaque to light
an X-ray of her left knee
Any of various manta rays, especially the small Indo-Pacific Mobula diabolus.
A fish belonging to the class Actinopterygii, to which most living bony fishes belong and which includes those having thin fins supported by slender dermal rays; an actinopterygian fish.
A format of DVD designed for the storage of high-definition video and data
(In science fiction) a gun causing injury or damage by the emission of rays
A ray or single particle of alpha radiation; (attributive or in plural) alpha radiation.
A ray of light that gives a sensation of green when perceived; usually in plural.
= medullary ray.
A mark caused by the exposure of a ray on the surface of (quarter-sawn) timber.
Optics and Computing. = ray tracing 3.
Optics. To calculate the path taken by a ray of light in passing through (an optical system) or in forming (an image).
Any of various rough-skinned rays; specifically (in recent use) Raja radula of the Mediterranean.
(In science fiction) a beam or ray capable of killing
A large long-tailed ray which has a fleshy horn-like projection on each side of the mouth. It occurs on or near the surface of warm seas and feeds on plankton
A large marine ray with long pointed pectoral fins, a long tail, and a distinct head
(1902–84) US entrepreneur and philanthropist; full name Raymond Albert Kroc. In 1955, he began his franchise empire of McDonald’s fast-food restaurants
A pale brown ray, Raja brachyura, of south-west European waters.
A short-nosed ray, Raja microocellata, of the eastern Atlantic, having a grey back covered with white spots and lines.
Optics. A ray with abnormal properties that arises in the course of certain calculations; specifically one that does not obey Snell's law of refraction.
A fungal disease of chrysanthemums that causes collapse and rotting of the leading shoot
A diagram showing straight lines radiating from a central object.
(Of a fish) having fins supported by rays; actinopterygian.
An actinomycete (mycelium-forming bacterium); especially a pathogenic member of the genus Actinomyces.
Generated or calculated by means of ray tracing.
Computing. A program for generating images by means of ray tracing.
Optics. The calculation of the path taken by a ray of light through an optical system such as a lens or a telescope; an instance of this.
(1904–87), US dancer and actor; full name Raymond Wallace Bolger. He is best known for his role as the scarecrow in The Wizard of Oz (1939)
A beam of electrons emitted from the cathode of a high-vacuum tube
(1930–2004), American pianist and singer; born Ray Charles Robinson. Totally blind from the age of 6, he drew on blues, jazz, and country music for songs such as ‘What’d I Say‘ (1959) and ’Georgia On My Mind' (1960)
A highly energetic atomic nucleus or other particle travelling through space at a speed approaching that of light
(1907–86), US actor; born in Wales; born Reginald Alfred John-Truscott-Jones. His many movies include The Lost Weekend (1945), A Life of Her Own (1950), and Dial M for Murder (1954)
(In a composite flower head of the daisy family) any of a number of strap-shaped and typically sterile florets that form the ray. In plants such as dandelions the flower head is composed entirely of ray florets
An imaginary line representing the path of light from an object to the eye
An invisible constituent of light which acts on a photographic plate and has other chemical effects; an actinic ray; an ultraviolet ray; usually in plural.
Each of the sheets of tissue in the stem of a dicotyledonous plant that extend radially from the pith to the cortex between the vascular bundles (also called primary ray); (formerly also) †a secondary ray, in the secondary vascular tissue of a plant (obsolete).
Optics a ray passing through or reflected at the centre of a lens or mirror, or passing through the centre of the entrance pupil.
The treatment of disease by means of X-rays or other ionizing radiation.
A celestial object that is a very strong but transient emitter of X-rays, typically a binary system with either a neutron star or a black hole as the receptor (rather than a white dwarf as in an ordinary nova).
Any compact celestial emitter of X-rays (not necessarily a star), such as an X-ray binary or an X-ray pulsar.