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| antiparticle |
in physics, either of two subatomic particles that have the same mass, spin, degree of charge, and magnetic moment but that have opposite signs of charge and directions of magnetic moment and whose collision causes mutual annihilation. |
| backspin |
a reverse spin put on a ball, such as a billiard or tennis ball, that causes it to stop suddenly or move in a backward direction. |
| baryon |
in physics, a heavy subatomic particle of half-integral spin, such as a proton, neutron, or hyperon. |
| flip1 |
to toss sharply so as to cause to turn over or spin. [1/9 definitions] |
| gyrate |
to move or revolve on or around a fixed point or axis, or in a circle or spiral; rotate; spin. |
| lepton2 |
any of a group of subatomic particles such as the electron, muon, and neutrino that have a spin of one-half and very little or no mass. |
| magnetic moment |
a torque exerted by the spin of nuclear particles and their orbital movement around a nucleus. [1/2 definitions] |
| neutrino |
an elementary, weakly interacting subatomic particle of the lepton family, having little or no mass and a spin of one-half. |
| neutron |
an elementary particle having no charge, spin of one-half, and mass approximately equal to a proton, present in the nucleus of all atoms except the common isotope of hydrogen. |
| photon |
the fundamental unit of electromagnetic energy with zero mass, no electrical charge, and a spin of one, usu. regarded as an elementary particle. |
| positron |
in physics, an elementary particle equal to an electron in mass, spin, and magnitude of charge, but whose charge is positive. |
| quantum |
a discrete and irreducible unit of measurement, such as the spin of an elementary particle. [1/3 definitions] |
| revolve |
to turn or spin on an axis. [1/6 definitions] |
| roll |
to cause to spin or turn over. [1/32 definitions] |
| silkworm |
the larva of an Asian moth that spins pure and commercially valued silk to form its cocoon, or any of various other moth larvae that spin cocoons of similar material. |
| spider |
any of various eight-legged invertebrates, related to mites and ticks, that typically spin webs in which to nest and catch their prey. |
| spin |
the act of spinning or causing something to spin. [1/15 definitions] |
| spinless |
combined form of spin. |
| spitball |
an illegal pitch in baseball in which the pitcher causes the ball to curve or spin by rubbing it with saliva. [1/2 definitions] |
| spun |
past tense and past participle of spin. [1/2 definitions] |
| swim |
to seem to spin or move crazily. [1/10 definitions] |
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