(anatomy) The curving portion of the aorta that bends between the ascending aorta and the descending aorta, from which the brachiocephalic artery, left carotid artery, and left subclavian artery ar...

(biology) Having a single filament / (textiles) Relating to a monofilament

After maintenance.

(obsolete) To hang or be suspended over (something); to overhang. / (intransitive) Figuratively to hang over (someone) as a threat or danger.