Meanings
nounsquare annulus (plural square annuli)
plural square annuli
- the region enclosed by two concentric squares with parallel sides
Origin
By analogy with annulus, which is the region enclosed by two concentric circles.
Full word history & related roots →Cite this entry
APA
square annulus. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/square%20annulus
MLA
“square annulus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/square%20annulus. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “square annulus,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/square%20annulus.
Source: square annulus on Wiktionary, CC BY-SA 4.0.