◙ noun 1. [常作 sinuses] [Anatomy & Zoology] a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavitie • [剖，动] 窦 an irregular venous or lymphatic cavity, reservoir, or dilated vessel • 静脉（或淋巴）窦 [Medicine] an infected tract leading from a deep-seated infection and discharging pus to the surface • [医] 瘘管 [Botany] a rounded notch between two lobes on the margin of a leaf or petal • [植] 弯缺 2. [as modifier] [Physiology] relating to or denoting the sino-atrial node of the heart or its function as a pacemaker • [生理] 窦房的 »sinus rhythm. 窦律。 »sinus tachycardia. 窦性心搏过速。
【语源】
1. late Middle English (in the medical sense): from Latin, literally a recess, bend'