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noun, Astronomy.
either of the two planets whose orbits are inside the orbit of the earth: Venus and Mercury.
either of the planets Mercury and Venus, whose orbits lie inside that of the earth
inferior planet
Either of the planets Mercury or Venus, whose orbits lie between Earth and the Sun. Because these planets lie in the general direction of the Sun, they can only be seen a few hours before sunrise or after sunset and are always positioned relatively near the horizon, never overhead. Inferior planets go through a complete cycle of phases as viewed from Earth, although their full phase, which occurs on the far side of the Sun, is lost in its glare. Compare superior planet. See also inner planet.


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    inferior posterior serratus muscle inferior posterior ser·ra·tus muscle (sə-rā’təs) n. A muscle with origin from the two lower thoracic and two upper lumbar vertebrae, with insertion into the last four ribs, whose action draws the lower ribs backward and downward, with nerve supply from the ninth to the twelfth intercostal nerves.

  • Inferior pulmonary vein

    inferior pulmonary vein n.

  • Inferior rectal nerve

    inferior rectal nerve n. Any of several branches of the pudendal nerve that pass to the external sphincter muscle of the anus and that supply the skin of the anal region.

  • Inferior rectal vein

    inferior rectal vein n. Any of the veins that pass to the internal pudendal vein from the venous plexus around the anal canal.

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