| hyperon | (n) any baryon that is not a nucleon; unstable particle with mass greater than a neutron |
| hyperon | n. (Physics) Any baryon that is not a nucleon; it is an unstable particle with a mass greater than that of a neutron. [ WordNet 1.5 ] |
| ハイペロン | [haiperon] (n) hyperon [Add to Longdo] |