a phase of the moon lying between last quarter and new moon, when it appears as a waning crescent
the moon when it appears as a waning crescent
the time at which this occurs
Collins English Dictionary - Complete & Unabridged 10th Edition
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Other names for this month's full moon include old moon and ice moon.
The rocket would be ready to launch several years earlier than under the old moon plan.
The dusty old moon is still a hotspot for space missions around the world.