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“arc”
arc
A portion of the circumference of a circle that is represented as a curved line.
This entry is located in the following unit:
Measurements and Mathematics Terms
(page 2)
(a radiographic technique that produces an image of a detailed cross section of bodily tissue using a narrow collimated beam of x-rays that rotates in a full arc around a patient to image the body in cross-sectional slices)
Word Entries containing the term:
“arc”
arc minute, arc second
Units for measuring small angles, used in astronomy.
An arc minute (symbol ') is one-sixtieth of a degree, and an arc second (symbol ") is one-sixtieth of an arc minute. Small distances in the sky, as between two close stars or the apparent width of a planet's disk, are expressed in minutes and seconds of arc.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 3)