noun, Zoology, Botany.
a small spine.
(biology) a very small spine, thorn, or prickle
- Spin vector
spin vector Physics A vector quantity used to represent the spin angular momentum of a particle. Its magnitude represents the magnitude of the spin, while its direction lies along the axis of rotation of the particle, following the right hand rule.
noun, Physics. 1. a magnetic wave propagated through a crystal lattice by a collective excitation of the spin angular momentum of electrons. spin wave Physics A wave propagated through a crystal lattice as a result of shifts in atomic magnetic fields associated with the spin angular momentum of electrons in the lattice.
adjective, spinier, spiniest. 1. abounding in or having spines; thorny, as a plant. 2. covered with or having sharp-pointed processes, as an animal. 3. in the form of a spine; resembling a spine; spinelike. 4. troublesome or difficult to handle; thorny: a spiny problem. adjective spinier, spiniest 1. (of animals) having or covered with quills […]
noun 1. echidna. spiny anteater noun 1. another name for echidna