三み十そ日か月づき

noun

new moon; invisible moon

Rare, poetic term for the new moon, specifically the phase when the moon is completely invisible. More commonly expressed as 新月 (しんげつ) or 朔 (さく).

• 三み十そ日か月づきの夜よるは、空そらが真まっ暗くらで星ほしがよく見みえる。

  On the night of the new moon, the sky is pitch black and the stars are clearly visible.