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WordReference Random House Learner's Dictionary of American English © 2024ra•di•al /ˈreɪdiəl/USA pronunciation adj. - Mathematicsarranged or having parts arranged like lines coming out of the center of a circle.
- Mathematicsgoing from the center outward or from the circumference inward along a line:radial motion.
n. [countable] - a radial section, part, or structure.
- Automotiveradial tire.
ra•di•al•ly, adv. WordReference Random House Unabridged Dictionary of American English © 2024ra•di•al (rā′dē əl),USA pronunciation adj. - Mathematicsarranged like radii or rays.
- Mechanical Engineeringhaving spokes, bars, lines, etc., arranged like radii, as a machine.
- Mathematicsmade in the direction of a radius;
going from the center outward or from the circumference inward along a radius:a radial cut. - Zoologypertaining to structures that radiate from a central point, as the arms of a starfish.
- Mathematicsof, like, or pertaining to a radius or a ray.
- [Mach.]
- Mechanical Engineeringhaving pistons moving inward and outward from a central point or shaft:a radial engine; a radial pump.
- Mechanical Engineeringnoting a bearing designed primarily to take thrusts radial to the center of rotation.
- Anatomyof, pertaining to, or situated near the radius.
- Mathematicsacting along or in the direction of the radius of a circle:radial motion; radial velocity.
n. - a radial section or construction.
- AutomotiveSee radial tire.
- Medieval Latin radiālis, equivalent. to Latin radi(us) beam, ray (see radius) + -ālis -al1
- 1560–70
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