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Added 9 October 2026

annulus

/ˈænjʊləs/ noun

In Latin: anulus Wiktionary

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about annulus at Wordnik → Where our words come from →

A toroidal shape.
a ring of ships in the harbor
(Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar.

Origin

Learned borrowing from Medieval Latin ānnulus, a misspelling of Latin ānulus (“ring, especially one worn on a finger”), from ānus (“ring”) (possibly from Proto-Indo-European *h₁eh₂-n-o- (“ring”), from an uncertain root) + -ulus (diminutive suffix). The plural form annuli is a learned borrowing from Medieval Latin ānnulī.

From Wiktionary, via Kaikki.org (CC BY-SA)

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