button spider
noun
1- a highly venomous African spider which is a close relative of the American black widow纽扣蜘蛛。
1.1
- A subspecies of Latrodectus mactans, family Theridiidae.黑寡妇蜘蛛（拉丁名Latrodectus mactans）的亚种, 球蛛科。