plane figure with five angles and five sides, 1560s, from Middle French pentagone or directly from Late Latin pentagonum "pentagon," from Greek pentagonon, noun use of neuter of adjective pentagonos "five-angled," from pente "five" (see five) + gonia "angle" (see -gon). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945. Related: Pentagonal.
In nature, pentagonal symmetry is rare in inanimate forms. Packed soap bubbles seem to strive for it but never quite succeed, and there are no mineral crystals with true pentagonal structures. But pentagonal geometry is basic to many living things, from roses and forget-me-nots to sea urchins and starfish. [Robert Bringhurst, "The Elements of Typographic Style," 1992]
实用例句
1. The Pentagon will give preference to companies which do business electronically.
美国国防部将会优先考虑那些能够进行电子商务的公司。
来自柯林斯例句
2. Pentagon spokes-man Williams says those talks are coming along quite well.
五角大楼发言人威廉斯说那些会谈进展得相当顺利。
来自柯林斯例句
3. A group of people made a circle around the Pentagon.
一群人在五角大楼四周围成一圈。
来自柯林斯例句
4. The Pentagon says bad weather is hampering the allied air raids.
