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Sinus Iridum
[
see
-n
uh
s
ir
-i-d
uh
m,
sahy
- ]
SHOW IPA
/ ˈsi nəs ˈɪr ɪ dəm, ˈsaɪ- /
PHONETIC RESPELLING
noun
(
Bay of Rainbows
) a semicircular dark plain in the second quadrant of the face of the moon.