JMdict: 1255920

月齢 【げつれい】

  1. [n] age of the Moon; number of days since the new moon
  2. [n] age in months (e.g. of an infant)
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
月 Month, Moon ゲツ, ガツ つき
齢 Age レイ よわい, とし