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sawfish

(Encyclopedia)sawfish: see ray.

stingray

(Encyclopedia)stingray: see ray.

whipray

(Encyclopedia)whipray: see ray.

mermaid's purse

(Encyclopedia)mermaid's purse: see ray.

torpedo , in zoology

(Encyclopedia)torpedo, fish: see ray.

skate

(Encyclopedia)skate, fish: see ray.

fluoroscope

(Encyclopedia)fluoroscope flo͝orˈəskōp [key], instrument consisting of an X-ray machine (see X ray) and a fluorescent screen that may be used by physicians to view the internal organs of the body. During medica...

refraction

(Encyclopedia)refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. O...

Los Alamos

(Encyclopedia)Los Alamos lôs ălˈəmōsˌ, lŏs [key], uninc. town (1990 pop. 11,455), seat of Los Alamos co., N central N.Mex. It is on a long mesa extending from the Jemez Mts. The U.S. government chose the sit...

Willughby, Francis

(Encyclopedia)Willughby, Francis wĭlˈəbē [key], 1635–72, English naturalist. He is known especially for his early systematic work on birds and fishes, in which he made some of the most important contributions...