from appearances alone

a branch of the ophthalmic artery; enters the eyeball with the optic nerve

a motor vehicle with two wheels and a strong frame, A two-wheeled vehicle having a motor attached so as to be self-propelled. In common usage, a motorcycle is of heavier construction with larger wheels, a more powerful motor, and a higher maximum speed than a motorbike, An open-seated motor-powered vehicle with two wheels, verb_ To motor around on a motorcycle; to ride, ride a motorcycle, intransitive verb_ to ride a motorcycle

in an active manner; nimbly; briskly; energetically; also, by one's own action; voluntarily, not passively