arc tangent

noun Trigonometry.

the angle, measured in radians, that has a tangent equal to a given number. Abbreviation: arc tan; Symbol: tan⁻¹

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Also called inverse tangent.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Arc tangent is always a great word to know.

So is bezoar. Does it mean:

a fool or simpleton; ninny.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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American Heritage

Science Dictionary

arc tangent
The inverse of the tangent function.

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