noun

• (entomology) Any of several papilionid butterflies of the genus Parnassius, especially Parnassius apollo of Eurasia (also known as the mountain apollo).

name

• (Greek mythology, Roman mythology) The son of Zeus and Leto (or Jupiter and Latona), and the twin brother of Artemis (or Diana). He was the god of light, music, medicine, and poetry; and prophecy, dance, manly beauty, and more.
  "‘Blue are the hills that are far away,’ is an owercome in the countryside, and while at first on his side it may have been but a young man’s fancy, to her he was like the god Apollo descending from the skies."
• (astronomy) The planet Mercury, when observed as a Morning Star.
• (astronomy) Short for 1862 Apollo, an Apollo asteroid.
• (NASA, space science) A United States space program, and the vehicles it created, used for human travel to the moon.
  "Apollo 11 landed people on the moon for the first time."

noun

• (astronomy) An asteroid possessing an orbit that crosses the orbit of the Earth and an orbital period of over one year, with semimajor axes greater than 1 AU, and perihelion distances less than 1.017 AU.