annulus

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

  1. noun a toroidal shape
  2. noun (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar

Etymology

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.

In classic literature

Synonyms

ring, halo, doughnut, anchor ring

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