満月

1. Origins, structure, and basic meaning

• Structure: 満月 is read まんげつ and is a noun for the moon when it appears fully round.
• Basic usage: It is used for the moon's appearance in the night sky or for the lunar state of a given night.

2. Common pitfalls and similar expressions

• Scope of the expression
  • It is not the general word for the moon; it refers to the particular state in which the moon appears full.