Radius

·noun The barbs of a perfect feather.

II. Radius ·noun Radiating organs, or color-markings, of the radiates.

III. Radius ·noun The movable limb of a sextant or other angular instrument.

IV. Radius ·noun A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. ·see Ray, 2.

V. Radius ·noun A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.

VI. Radius ·noun The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. ·see ·Illust. of Artiodactyla.

radius
rădĭus, ii, m. [cf.: radix, ramus], a staff, rod. I In gen.: acuti radii immissi, stakes , Liv. 3...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
radius
radius ī, m 2 RAD-, a staff, rod : acuti, stakes , L.—In a wheel, a spoke : hinc radios trivere ...

An Elementary Latin Dictionary
radius
The semi-diameter of a circle, limb of a sextant, &c. ...

The Sailor's Word-Book
Radius vector
·noun An ideal straight line joining the center of an attracting body with that of a body describing...

Webster's Dictionary of the English Language
radius-vector
An imaginary line joining the centres of the sun and a planet or comet in any point of its orbit. ...

The Sailor's Word-Book
radius-bar of parallel motion
An intervening lever for guiding the side-rods of a steam-engine. ...

The Sailor's Word-Book