any projection that is thought to resemble a human arm | a measuring instrument for measuring the angular distance between celestial objects; resembles an octant |
the graduated arc that is attached to an instrument for measuring angles | a unit of angular distance equal to 60 degrees |
either of the two halves of a bow from handle to tip | |
one of the jointed appendages of an animal used for locomotion or grasping: arm, leg, wing, flipper | |
(astronomy) the circumferential edge of the apparent disc of the sun or the moon or a planet | |
any of the main branches arising from the trunk or a bough of a tree | |