(Greek mythology) Greek god of light; god of prophecy and poetry and music and healing; son of Zeus and Leto; twin brother of Artemis
"The ancient Greeks revered Apollo as the sun god who wielded a golden bow to protect his flock."
A very handsome young man.
"The newly discovered Apollo is a hazardous near-Earth asteroid whose highly elliptical path brings it dangerously close to our planet while completing an orbit in more than one year."
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.
In plain English: Apollo is the name of an ancient Greek god who was known as the ruler of music, poetry, and healing arts.
"The Apollo spacecraft successfully landed astronauts on the moon in 1969."
The planet Mercury, when observed as a Morning Star.
"The ancient sailors named the morning star Apollo before realizing it was actually Mercury."
The name Apollo comes from the Ancient Greek word Apóllōn and entered English through Latin. It has retained its original meaning as the god of light, music, and prophecy throughout its history.