lunar

باللغة العربية: عَظْم هِلَالِيّ، مَسَافَة قَمَرِيَّة

1. The middle bone of the proximal series of the carpus in the wrist, which is shaped like a half-moon.
2. An observation of a lunar distance (“the angle between the Moon and another celestial body”), especially for establishing the longitude of a ship at sea.

الجمع lunars