pentagram
词根词缀：
pentagon n. 五角形；五角大楼
penta 五 + gon 角 → 五角形，也指美国五角大楼
pentagram n. 五角星形
penta 五 + gram 写，图 → 五角的图 → 五角星形
pentoxide n. 五氧化物
pent〔 = penta〕五 + oxide 氧化物 → 五氧化物
数据来源：新东方英语词汇速记大全
相关例句：
Another collection is red pentagram for boys.
还有男孩的收藏品就是红五星。
The carambola seen from the front appears to the viewer as a pentagram, but a carambola seen from the side appears to be another thing.
杨桃从正面看上去像一颗五角星，但是从另外的角度看又像其他的东西。
I came home one night and found a pentagram in my yard.
一天晚上我回家看到院子里的五角星。
You will also want to do the lesser Banishing Ritual of the pentagram!
你也要做小五星的祛除仪式！
And this is a polygon describing a pentagram
下面是一个描述五角星形的多边形
If the information they're giving is valuable and truthful like with "Watergate" or "the Pentagram Papers", and their motive don't matter.
如果他们提供了宝贵且真实的信息，如同“水门事件”案或“五角大楼文件”案，那么他们的动机就不重要了。