9-letter words containing gray
- gray area — uncertain, unclear issue
- gray body — any body that emits radiation at each wavelength in a constant ratio less than unity to that emitted by a black body at the same temperature.
- gray card — a card of controlled reflectance held near a subject to approximate middle tones and used as a target for an exposure meter.
- gray code — (hardware) A binary sequence with the property that only one bit changes between any two consecutive elements (the two codes have a Hamming distance of one). The Gray code originated when digital logic circuits were built from vacuum tubes and electromechanical relays. Counters generated tremendous power demands and noise spikes when many bits changed at once. E.g. when incrementing a register containing 11111111, the back-EMF from the relays' collapsing magnetic fields required copious noise suppression. Using Gray code counters, any increment or decrement changed only one bit, regardless of the size of the number. Gray code can also be used to convert the angular position of a disk to digital form. A radial line of sensors reads the code off the surface of the disk and if the disk is half-way between two positions each sensor might read its bit from both positions at once but since only one bit differs between the two, the value read is guaranteed to be one of the two valid values rather than some third (invalid) combination (a glitch). One possible algorithm for generating a Gray code sequence is to toggle the lowest numbered bit that results in a new code each time. Here is a four bit Gray code sequence generated in this way: 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 0 0 1 1 0 0 1 1 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 1 1 1 1 1 1 1 1 0 1 0 1 0 1 0 1 1 1 0 0 1 1 0 0 0 The codes were patented in 1953 by Frank Gray, a Bell Labs researcher.
- gray duck — any of several ducks in which certain immature or female plumages are predominantly gray, as the gadwall and the pintail.
- gray iron — pig iron or cast iron having much of its carbon in the form of graphite and exhibiting a gray fracture.
- gray lady — a female worker in the American Red Cross who serves as a volunteer aide in medical services.
- gray mold — a disease of plants, characterized by a gray, furry coating on the decaying parts, caused by any of several fungi.
- gray pine — jack pine.
- gray wolf — a wolf, Canis lupus, having a usually grizzled, blackish, or whitish coat: formerly common in Eurasia and North America, some subspecies are now reduced in numbers or near extinction.
- graybacks — Plural form of grayback.
- graybeard — Sometimes Disparaging. a man whose beard is gray; old man; sage.
- grayhound — one of a breed of tall, slender, short-haired dogs, noted for its keen sight and swiftness.
- graylings — Plural form of grayling.
- grayscale — a scale of achromatic colors having several, usually ten, equal gradations ranging from white to black, used in television and photography.
- graystone — (uncountable) A type of gray, volcanic rock, typically containing feldspar and iron.
- graywacke — Geology. a dark-gray coarse-grained wacke.
- graywater — dirty water from sinks, showers, bathtubs, washing machines, and the like, that can be recycled, as for use in flushing toilets.
- iron gray — a medium shade of gray, like that of freshly broken iron.
- iron-gray — a medium shade of gray, like that of freshly broken iron.
- navy gray — a dark gray, as of a warship.
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