Xray

communications code word \ ˈeks-ˌrā \

Definition of Xray

—used as a code word for the letter x

First Known Use of xray

1943

in the meaning defined above

See Words from the same year

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x-ray

verb, often capitalized \ ˈeks-ˌrā \

Definition of x-ray

x-rayed; x-raying; x-rays

transitive verb

: to examine, treat, or photograph with X-rays

See x-ray defined for English-language learners

See x-ray defined for kids

First Known Use of x-ray

1899

in the meaning defined above

See Words from the same year

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Other Medicine Terms

analgesia, angina, diabetes, hepatitis, homeopathy, logorrhea, palliate, pandemic

X-ray

noun \ ˈeks-ˌrā \

Definition of X-ray

1 : any of the electromagnetic radiations that have an extremely short wavelength of less than 100 angstroms and have the properties of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, and of acting on photographic films and plates as light does

2 : a photograph obtained by use of X-rays

—

X-ray

adjective

See X-ray defined for English-language learners

See X-ray defined for kids

First Known Use of x-ray

1896

in the meaning defined at sense 1

See Words from the same year

NEW! Time Traveler

Other Medicine Terms

analgesia, angina, diabetes, hepatitis, homeopathy, logorrhea, palliate, pandemic

XRAY Defined for English Language Learners

x-ray

verb

Definition of x-ray for English Language Learners

: to examine and make images of (things, such as the bones and organs inside the body) by using X-rays

X-ray

noun

Definition of X-ray for English Language Learners

X-rays : powerful invisible rays that can pass through various objects and that make it possible to see inside things (such as the human body)
: an image that is created by using X-rays and that is usually used for medical purposes
: a medical examination that involves using X-rays

XRAY Defined for Kids

x-ray

verb, often capitalized X \ ˈeks-ˌrā \

Definition of x-ray for Students

x-rayed; x-raying

: to examine, treat, or photograph with X-rays My arm was x-rayed for broken bones.

X-ray

noun \ ˈeks-ˌrā \

Definition of X-ray for Students

1 : a powerful invisible ray made up of very short waves that is somewhat similar to light and that is able to pass through some solids and acts on photographic film like light

2 : a photograph taken by the use of X-rays

an X-ray of the lungs

History for x-ray

In November, 1895, the German scientist Wilhelm Röntgen was conducting an experiment on the properties of electron tubes. He noticed that a fluorescent surface in the vicinity of the tube would light up even if shielded from the tube's direct light. A thick metal object would block some of the rays, while a less dense object such as wood would cast only a weak shadow. Röntgen's explanation was that the tube produced some type of invisible radiation that could pass through substances that blocked ordinary light. Because he did not know the nature of this radiation, he named it X-Strahl—translated into English as X-ray—based on the mathematical use of x to indicate an unknown quantity.

Medical Dictionary

x-ray

transitive verb, often capitalized X \ ˈeks-ˌrā \

medical Definition of x-ray

: to examine, treat, or photograph with X-rays

X-ray

noun

medical Definition of X-ray

1 : any of the electromagnetic radiations of the same nature as visible radiation but of an extremely short wavelength less than 100 angstroms that is produced by bombarding a metallic target with fast electrons in vacuum or by transition of atoms to lower energy states and that has the properties of ionizing a gas upon passage through it, of penetrating various thicknesses of all solids, of producing secondary radiations by impinging on material bodies, of acting on photographic films and plates as light does, and of causing fluorescent screens to emit light — called also roentgen ray

2 : a photograph obtained by use of X-rays