Principal nursing officer
noun
1.
a grade of nurse concerned with administration in the British National Health Service
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principal optic axis n. A line extending through the center of a lens at a right angle to the lens surface.
- Principal-parts
noun, (used with a plural verb) Grammar. 1. a set of inflected forms of a form class from which all the other inflected forms can be derived, as sing, sang, sung; smoke, smoked. principal parts plural noun 1. (grammar) the main inflected forms of a verb, from which all other inflections may be deduced. In […]
- Principal-plane
noun, Optics. 1. a plane that is perpendicular to the axis of a lens, mirror, or other optical system and at which rays diverging from a focal point are deviated parallel to the axis or at which rays parallel to the axis are deviated to converge to a focal point.
- Principal-point
noun, Optics. 1. the point where a principal plane intersects the axis. principal point n. One of the two points in an optical system where the axis is cut by the two principal planes. Lines drawn from these to corresponding points on the object and the image will be parallel.
- Principal-quantum-number
noun, Physics. 1. the nonnegative, integral quantum number that defines the stationary orbits in the Bohr model of the atom.