1. Part of a planet's orbit nearest the sun.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• pirhelion,
• perhelion,
• oerihelion,
• lerihelion,
• -erihelion,
• 0erihelion,
• pwrihelion,
• psrihelion,
• pdrihelion,
• prrihelion,
• p4rihelion,
• prihelion,
• preihelion,
• perihellion,
• parihelion,
• perdullion,
• perduelion,
• periheliun,
• Perriecion,
• pareihelion

• Pearline.

The adjective form of the word "perihelion" is "perihelionic".

The plural of the "perihelion" can be the "perihelia".

The singular of the "perihelion" can be the "perihelion".