Indivisible /(?)/

In·di·vis·i·ble

Indivisible

a.
  1. Not divisible; incapable of being divided, separated, or broken; not separable into parts.
  2. Not capable of exact division, as one quantity by another; incommensurable. (Math.)

Indivisible

n.
  1. That which is indivisible.
    By atom, nobody will imagine we intend to express a perfect indivisible, but only the least sort of natural bodies.
    — Digby.
  2. An infinitely small quantity which is assumed to admit of no further division. (Geom.)

Phrases & Compounds
Method of indivisibles
a kind of calculus, formerly in use, in which lines were considered as made up of an infinite number of points; surfaces, as made up of an infinite number of lines; and volumes, as made up of an infinite number of surfaces.