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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. |
| fan1 |
a machine that makes air move by means of blades that spin. |
| flip1 |
to throw in such a way as to cause to turn over or spin. |
| 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. |
| propeller |
a device used to make an airplane or ship move forward. A propeller is made of tilted blades that are attached to and spin around a hub. |
| quantum |
a discrete and irreducible unit of measurement, such as the spin of an elementary particle. [1/3 definitions] |
| revolve |
to turn or spin in place. [1/3 definitions] |
| roll |
to cause to spin or turn over. [1/32 definitions] |
| silkworm |
a caterpillar of a moth, originally from Asia. The caterpillar makes silk thread that it uses to spin its cocoon. People use the cocoons to make silk cloth. |
| spider |
a small animal with eight legs and a body made up of two parts. Most spiders spin webs in which they nest and catch insects to eat. Spiders are related to mites, ticks, and scorpions. |
| spin |
the act of spinning or causing something to spin. [1/8 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] |
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