The degree to which a lens, mirror, or other optical system converges or diverges light, equal to the reciprocal of the focal length of the device.

plural of refractive power

Synonym of optical power

A form of feminism that actively attempts to challenge and overcome discrimination against women.

present participle of keep the powder dry

simple past tense and past participle of keep the powder dry

Third-person singular simple present indicative form of keep the powder dry

Alternative form of keep one's powder dry

(cooking, historical) A medieval spice mixture similar to powder-douce, but incorporating more pungent flavours such as pepper.

uninterruptible power supply