Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Previous word: perigynous
Next word: peril
Definition of: perihelion
(per′ə·hē′lē·ən) noun plural ·li·a (-lē·ə) Astron.
The point in the orbit of a planet or comet where it is nearest the sun: opposed to aphelion. [<NL perihelium <Gk. peri- close about + hēlios the sun; refashioned after Greek]
Comment about this word, ask questions, or add new information about this topic: