antimatter
noun
an·ti·mat·ter 
ˈan-tē-ˌma-tər,
ˈan-ˌtī- : matter composed of antiparticles
Example Sentences
Recent Examples on the Web No, these mattresses are not stuffed with caviar or antimatter or five hundred and thirty-nine thousand dollars in unmarked bills. 
Patricia Marx, The New Yorker, 20 June 2022 The first and most well-known parameter, charge-parity (CP) violation, dictates whether neutrinos and their antiparticle counterparts oscillate in the same way, and could help explain why there is more matter than antimatter in the universe. Thomas Lewton, Scientific American, 13 Apr. 2022 In addition, this system involves interactions between antimatter and regular matter, which can be difficult to capture due to their violent ends. John Timmer, Ars Technica, 16 Mar. 2022 Someone to do jobs that are probably fatal, like clean out the antimatter chamber, or explore a totally unknown environment. Tom Shippey, WSJ, 13 May 2022 Antiprotons are the antimatter version of protons, with exactly the same mass but opposite charge. John Conway, The Conversation, 14 Apr. 2022 Doing these measurements presented a significant challenge, however, and not just because of the tendency of matter and antimatter to annihilate each other. John Timmer, Ars Technica, 16 Mar. 2022 Both of these types of antimatter likely form during the collision of cosmic rays. Jennifer Leman, Popular Mechanics, 7 Oct. 2021 And the decay of heavy neutrinos moments after the Big Bang has been suggested as the possible reason why there’s so much more matter than antimatter in the universe. Quanta Magazine, 28 Oct. 2021 See More
Patricia Marx, The New Yorker, 20 June 2022 The first and most well-known parameter, charge-parity (CP) violation, dictates whether neutrinos and their antiparticle counterparts oscillate in the same way, and could help explain why there is more matter than antimatter in the universe. Thomas Lewton, Scientific American, 13 Apr. 2022 In addition, this system involves interactions between antimatter and regular matter, which can be difficult to capture due to their violent ends. John Timmer, Ars Technica, 16 Mar. 2022 Someone to do jobs that are probably fatal, like clean out the antimatter chamber, or explore a totally unknown environment. Tom Shippey, WSJ, 13 May 2022 Antiprotons are the antimatter version of protons, with exactly the same mass but opposite charge. John Conway, The Conversation, 14 Apr. 2022 Doing these measurements presented a significant challenge, however, and not just because of the tendency of matter and antimatter to annihilate each other. John Timmer, Ars Technica, 16 Mar. 2022 Both of these types of antimatter likely form during the collision of cosmic rays. Jennifer Leman, Popular Mechanics, 7 Oct. 2021 And the decay of heavy neutrinos moments after the Big Bang has been suggested as the possible reason why there’s so much more matter than antimatter in the universe. Quanta Magazine, 28 Oct. 2021 See More Word History
First Known Use
1934, in the meaning defined above