英语词汇“X-ray”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词

X-ray

释义

X-ray /eksˈrā/

noun

An electromagnetic ray of very short wavelength which can penetrate matter opaque to light-rays, produced when high-energy electrons impinge on matter, discovered by Röntgen in 1895 (also adjective)

noun

A photograph taken by X-rays

transitive verb

To photograph or treat by, or otherwise expose to, X-rays

ORIGIN: X (symbol) after its unknown nature on discovery; translated from original Ger term X-Strahlen (pl), Strahl a ray

X-ray astronomy noun

A branch of astronomy using satellites or rockets to detect and measure X-ray emissions from stars, etc

X-ray crystallography noun

The study of crystal structures as shown by their diffraction of X-rays

X-ray diffraction noun

The characteristic interference pattern produced by X-rays passing through a crystal structure

X-ray micrography noun

The preparation, and study through the microscope, of radiographs obtained by means of X-rays

X-ray spectrum noun

A wavelength or frequency diagram in which a series of lines indicate by their positions the energy of the X-rays emitted by a body as the result of electron bombardment

X-ray telescope noun

A telescope designed to investigate the emission of X-rays from stars, etc

X-ray therapy noun

The use of X-rays for medical treatment

X-ray tube noun

A tube enclosing a vacuum, in which X-rays are emitted from a metal target placed obliquely opposite to an incandescent cathode whose high-energy electrons impinge on the target

characteristic X-rays

Secondary X-rays emitted when X-rays fall on matter, which contain monochromatic radiations that vary in wavelength according to the atoms from which they are scattered

Xray or xray /eksˈrā/

noun

(in international radio communication) a code word for the letter x

X or x /eks/

noun

The twenty-fourth letter in the modern English alphabet, twenty-first in the Roman, taken from the Chalcidian alphabet, and of the same form, though perhaps not the same origin, as Ionic and classical Greek chi (Χ, χ; pronounced /k-h/, and later /hh/)
Anything shaped like the letter X

—X was used in Old English medially and finally as a variant for cs. In modern English, medially and finally, it has the value of /ks/, as in extinct and axe, and, medially only, of /gz/, as in exist, or /ksh/, as usu in luxury, or /gzh/, as in luxurious; at the beginning of a word it is usu pronounced /z/, or (rarely) /gz/

X

symbol

(as a Roman numeral) 10
(also x or x) the first variable, unknown or yet to be ascertained quantity or factor (mathematics, etc)
Christ (see also chi¹), also used as an abbreviation, as in Xmas and Xian (Christian)
A former category of cinema film to which persons under eighteen were not admitted (superseded by the designation 18)
Used to indicate various other things, such as a choice on a ballot paper, an error on an examination paper, the signature of an illiterate person, etc, or a kiss

xˈ-axis noun (mathematics)

In a graph, the horizontal axis along which the x-coordinate is plotted. Cf y-axis, z-axis

Xˈ-body noun (botany)

An inclusion in a plant-cell suffering from a virus disease

Xˈ-chromosome noun

A chromosome associated with sex-determination, in mammals occurring paired in the female zygote and cell, and alone in the male zygote and cell

Xˈ-craft noun (historical)

A British midget submarine

Xˈ-factor noun

That part of a serviceman's or servicewoman's pay intended as compensation for the disruptions and disadvantages of life in the armed forces
An indefinable quality that sets a person or thing apart (informal)

Xˈ-generation another term for Generation X (see under generation).

xˈ-height noun (printing)

The height of a lower-case x, used as a measure of the height of a typeface

X-inactivāˈtion noun (biology)

The inactivation of one or other X-chromosome in female mammalian cells, with repression of most of the genes on the chromosome

Xˈ-particle noun

A meson

Xˈ-rated adjective

Of a film, in the former X category
Graphically violent or sexually explicit in content, language, etc

X-ray see separate entry.

X̄

symbol

(Roman numeral) 10000

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