noun Download 🔗Share (rare outside entomology) The mesial plane dividing the body into similar right and left halves. Examples : "Sentence: "When drawing a butterfly in biology class, the teacher emphasized that the mesons should be perfectly aligned to show bilateral symmetry." " anatomy biology organism part insect Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.) Examples : "Scientists study mesons to understand the strong force that holds the nucleus of an atom together. " physics mass science energy element Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (now specifically) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.) Examples : "Scientists study mesons to better understand the fundamental forces that hold matter together. " physics Chat with AIVocabulary GamePractice Reading