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manta

(Encyclopedia)manta: see ray.

whipray

(Encyclopedia)whipray: see ray.

sawfish

(Encyclopedia)sawfish: see ray.

stingray

(Encyclopedia)stingray: 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...

Wyss, Johann David

(Encyclopedia)Wyss, Johann David yōˈhän däˈvĭt vēs [key], 1743–1818, Swiss author. His Swiss Family Robinson (1813, tr. 1814), an internationally popular classic for children, relates the adventures of a s...