柯林斯詞典astragal /??str?ɡ?l/ 1. N a small convex moulding, usually with a semicircular cross section 一種有半圓橫截面的小凹面模型件 (Also called bead)2. N a moulding having the form of a string of beads 一串玻璃粉狀的模型件 返回 astragal