API unit

noun

A unit of radioactivity used for measuring natural gamma rays in the ground.

“The radioactivity of a typical shale is 100 API units.”

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Meanings

nounAPI unit (plural API units)

plural API units

  1. oil industryA unit of radioactivity used for measuring natural gamma rays in the ground.

    The radioactivity of a typical shale is 100 API units.

Origin

From API (“American Petroleum Institute”).

Full word history & related roots →
Cite this entry
APA

API unit. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/API%20unit

MLA

“API unit.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/API%20unit. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “API unit,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/API%20unit.

Source: API unit on Wiktionary, CC BY-SA 4.0.