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[see-nuh s ir-i-duh m, sahy-] /ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ-/
(Bay of Rainbows) a semicircular dark plain in the second quadrant of the face of the moon.


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  • Sinusitis

    noun, Pathology. 1. inflammation of a sinus or the sinuses. noun 1. inflammation of the membrane lining a sinus, esp a nasal sinus sinusitis si·nus·i·tis (sī’nə-sī’tĭs) n. Inflammation of the mucous membrane of a sinus, especially of the paranasal sinuses.

  • 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.

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