Any of a class of white stars which are found mainly in the Milky Way and Magellanic Clouds and whose spectra are characterized by very broad bright lines especially of hydrogen, helium, carbon, and nitrogen that indicate very hot unstable stars.

乌尔夫一拉叶星；W 型星(某一类白星；主要发现于银河及麦哲伦星云中。这种星的光谱的特征是许多由氢、氦、碳及氮等造成的宽阔光线，表示这是非常炽热的不稳定星)。