any of the paired sinuses in the bones of the face adjacent to the nasal cavity that are lined with mucous membrane that is continuous with the lining of the nasal cavities
noun
a hollow muscular organ in the pelvic cavity of females; contains the developing fetus
the part of the earth's surface covered with water (such as a river or lake or ocean)
noun
ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
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