frustumn.
英 'frʌstəm | 美 'frʌstəm
中文n. [数] 截头锥体；平截头体
词根词源
frustum (n.)"remaining piece after a part has been cut off," 1650s, in mathematics, from Latin frustum "piece broken off," from PIE *bhrus-to-, from root *bhreu- "to cut, break up" (see bruise (v.)).
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