/wɜ:l; [US] hw-; hwɝl/
n
1 one turn of a spiral （一圈）螺纹.
2 complete circle formed by the ridges of a fingerprint （指纹的）涡.
3 ring of leaves, petals, etc round the stem of a plant 轮生体（环生于植物茎部的叶、花瓣等）.

n[C]
[Date: 1400-1500; Origin: Probably from whirl]
a pattern made of a line that curls out in circles that get bigger and bigger
technical a circular pattern of leaves or flowers on a stem