API donut

API do·nut
UK/ˌeɪpiːaɪ ˈdəʊnʌt/US/ˌeɪpiaɪ ˈdoʊ(ˌ)nʌt/

noun

An information table found on cans of motor oil, conforming to U.S. standards, which indicates the weight (viscosity) and type of oil. The central circle provides the oil viscosity rating (ie. 10W50), while the upper annulus section provides the oil type (ie. SP).

Similar
API Service Symbol
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Meanings

nounAPI donut (plural API donuts)

plural API donuts

  1. USautomotiveAn information table found on cans of motor oil, conforming to U.S. standards, which indicates the weight (viscosity) and type of oil. The central circle provides the oil viscosity rating (ie. 10W50), while the upper annulus section provides the oil type (ie. SP).

    Synonyms: API Service Symbol, API service symbol

Synonyms & antonyms

nounAn information table found on cans of motor oil, conforming to U.S. standards, which indicates the weight (viscosity) and type of oil. The central circle provides the oil viscosity rating (ie. 10W50), while the upper annulus section provides the oil type (ie. SP).

Similar
API Service SymbolAPI service symbol
Also see
api service symbol

Origin

From API + donut; from American Petroleum Institute, and its shape.

Full word history & related roots →

Rhymes & wordplay

Rhymes with API donut

cronutHertz donuthyperdonutwonut
All rhymes →
Cite this entry
APA

API donut. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/API%20donut

MLA

“API donut.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/API%20donut. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “API donut,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/API%20donut.

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