a seabird with long wings and usually white and grey or black feathers. There are several types of gull. 海鸥 
a black-headed gull 黑头鸥 Hundreds of gulls were circling overhead. 数百只海鸥在头顶盘旋。
Word Originlate Middle English: of Celtic origin; related to Welsh gwylan and Breton gwelan.
