a motor-vehicle tire in which the plies or cords run from one bead to the other at right angles to both beads.
noun, Biology. 1. a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish. noun 1. a type of structure of an organism or part of an organism in […]
- Radioactive isotope
radioactive isotope n. An isotope having an unstable nucleus that decomposes spontaneously by emission of a nuclear electron or helium nucleus and radiation, thus achieving a stable nuclear composition.
noun, Physics, Chemistry. 1. a succession of elements initiated in the radioactive decay of a parent, as thorium or uranium, each of which decays into the next until a stable element, usually lead, is produced. noun 1. (physics) a series of nuclides each of which undergoes radioactive decay into the next member of the series, […]
noun 1. the radioactive by-products from the operation of a nuclear reactor or from the reprocessing of depleted nuclear fuel. noun 1. any waste material containing radionuclides Also called nuclear waste Radioactive materials that may be left after a commercial or laboratory process has been carried out. Some is “low-level” waste, such as objects that […]