Definition of sidereal month in English:

sidereal month

Syllabification: si·de·re·al month

noun

Astronomy
The time it takes the moon to orbit once around the earth with respect to the stars (approximately 27 1/ 4 days).
More example sentences
  • How would the synodic and sidereal months differ if the moon orbited the Earth in the opposite direction?
  • During the sidereal months of Sagittarius and Capricorn, the Sun is nearest to the earth.
  • Thus, a lunar month is longer than a sidereal month by about 1/12 th of a month, or two-and-a-half days roughly.

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the outward appearance or apparent form of something…