2. Ictus is often used by medical authors in the sense of percussus. It is applied to the pulsation of the arteries, to any external lesion of the body produced by violence also to the wound inflicted by a scorpion or venomous reptile. Orbis is used in the sense of circlo, circuit, rotundity. It is applied also to the eye balls. Oculi dicuntur orbes. Castelli Lexicon Medicum.