The antimatter counterpart of a neutrino, a ghostly subatomic particle with almost no mass that rarely interacts with ordinary matter.
From 'anti-' (prefix for antimatter) + 'neutrino' (from Italian physicist Fermi's diminutive of 'neutro'). Discovered in 1956 when scientists found evidence of antimatter particles.
Antineutrinos are produced in radioactive decay and nuclear reactions, and trillions pass through your body every second from the sun—yet you'll never detect one because they barely interact with matter at all.
Complete word intelligence in one call. Free tier — 50 lookups/day.