different between antimatter vs antiworld

English

Etymology

From anti- +? matter. Coined by British physicist Arthur Schuster in 1898 to describe matter that resists gravity in a jocular article in Nature titled "Potential Matter.—A Holiday Dream", but not used in a modern sense until the 1940s.

Alternative forms

• anti-matter

Pronunciation

• IPA^(key): /?ænti?mæt?/, /?ænta??mæt?/

Noun

antimatter (usually uncountable, plural antimatters)

1. (physics) Matter that is composed of the antiparticles of those that constitute normal matter.
2. (physics) A form of matter that has a key property, such as charge, opposite to that of ordinary matter.

Derived terms

• antimatter rocket

Translations

English

Etymology

anti- +? world

Noun

antiworld (plural antiworlds)

1. (astrophysics) A hypothetical world constructed from antimatter.
   • 1975, Sputnik (issue 7)

     But possibly there is an antiworld in which, in addition to matter, time is also negative. […] In such an antiworld man would grow younger with time and a broken glass would come together from its fragments.

   • 1982, Rudol?f Konstantinovich Balandin, Vladimir Vernadsky

     It follows that somewhere antiworlds consisting of antiparticles are bound to wander. No traces of these antiworlds have as yet been found.

   • 1988, Stephen Hawking, A Brief History of Time: From the Big Bang to Black Holes (page 75)

     There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don't shake hands!

Translations