Plural of frustum; the portions of a cone or pyramid remaining after the top is cut off by a plane parallel to the base.
From Latin 'frustum' (piece, morsel). The Latin plural 'frusta' is sometimes used in mathematical and scientific contexts, though 'frustums' is more common in English.
Mathematicians borrowed the Latin plural form 'frusta,' which shows how scientific language preserves ancient word forms—it sounds more official than 'frustums' to some scholars!
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