Plural of annulus; multiple ring-shaped structures or geometric figures consisting of the area between two concentric circles.
Latin plural of 'annulus,' preserving the classical language form. In English, particularly in mathematics and biology, scientists chose to retain the Latin plural rather than use 'annuluses.'
Mathematicians and biologists use 'annuli' (the fancy Latin plural) instead of 'annuluses' because it sounds more scientific—it's the academic version of code-switching, making a simple ring sound impressive!
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