radius
[C/U] Both
pl: radiipast: nullpp: nulling: nullcomp: nullsup: null
In a geometric sense, the word evokes a precise, radiating line that defines the reach or extent of a circular area. It is frequently used in technical, scientific, or mathematical contexts to establish a strict boundary of influence or distance.
Countable when referring to the specific bone in the arm or a specific line in a drawing. Uncountable when discussing the general concept of radial distance in a theoretical mathematical context.