ray

views updated May 21 2018

ray
1. (in optics) A narrow beam of radiation.

2. (in botany) See medullary ray.

A Dictionary of Biology

ray

views updated May 29 2018

ray1 line of light XIV (various techn. senses from XVII). — (O)F. rai :- L. radius; see RADIUS.

The Concise Oxford Dictionary of English Etymology T. F. HOAD

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ray (physics)

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