a large white bear, Ursus maritimus, of the arctic regions.
a white carnivorous bear, Thalarctos maritimus, of coastal regions of the North Pole
noun, Cell Biology. 1. one of the minute cells arising from the unequal meiotic divisions of the ovum at or near the time of fertilization. noun 1. (physiol) a tiny cell containing little cytoplasm that is produced with the ovum during oogenesis when the oocyte undergoes meiosis polar body n. Either of two small cells […]
- Polar bond
polar bond A type of covalent bond between two atoms in which electrons are shared unequally. Because of this, one end of the molecule has a slightly negative charge and the other a slightly positive charge. See more at covalent bond.
noun 1. Geology. the icecap situated at either end of the earth’s poles. 2. Astronomy. either of the two bright areas around the poles of the planet Mars, consisting of water ice and frozen carbon dioxide. polar cap
- Polar cataract
polar cataract n. A capsular cataract limited to the anterior or posterior polar region of the lens.