radius
1. ra.di.us \'ra-d-e--*s\ \-e--.i-\ n or ra.dii also ra.di.us.es [L, ray,
radius] pl 1a: the anterior and thicker and shorter bone of the human
forearm or of th e corresponding part of the forelimb of vertebrates above
fishes 1b: the third and usu. largest vein of an insect's wing 2: a line
segment extending from the center of a circle or sphere to the cu rve or
surface 3a: the distance of a radius 3b: the circular area defined by a
stated radius 3c: a bounded or circumscribed area 4: a radial part 5:
the distance from a center line or point to an axis of rotation 6: an
imaginary radial plane dividing the body of a radially symmetrical an imal
into similar parts
2. radius vt : to cut (as a fillet) on an arc of a circle