(mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light
(astronomy) a cluster of stars (or a small constellation)
例句
用作名词(n.)
In Greek myth, the Big Dipper asterism represents the hindquarters and tail of the constellation Ursa Major, the Great Bear.在希腊神话传说中，北斗七星的三星符号象征着大熊星座的后臀和尾巴。
