Sinus-iridum
[see-nuh s ir-i-duh m, sahy-] /ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ-/
noun
1.
(Bay of Rainbows) a semicircular dark plain in the second quadrant of the face of the moon.
Read Also:
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- Sinus-meridianii
[see-nuh s muh-rid-ee-ah-nee-ee, sahy-nuh s muh-rid-ee-ey-nee-ahy] /ˈsi nəs məˌrɪd iˈɑ niˌi, ˈsaɪ nəs məˌrɪd iˈeɪ niˌaɪ/ noun 1. an area on the equator of Mars, appearing as a dark region when viewed telescopically from the earth.
- Sinus-node
noun, Anatomy. 1. sinoatrial node. sinus node n. See sinoatrial node.
- Sinus of dura mater
sinus of dura mater n. Any of the various venous channels located in the dura mater and lined with epithelial cells. Also called cerebral sinus, dural sinus.
- Sinus-of-valsalva
[sahy-nuh s uh v val-sal-vuh] /ˈsaɪ nəs əv vælˈsæl və/ noun, Anatomy. 1. any of the pouches of the aorta and the pulmonary artery opposite the flaps of the semilunar valves into which blood returning to the heart flows, closing the valves.