pencil

Definitions

• (now) A paintbrush.
• A writing utensil with a graphite (commonly referred to as lead) shaft, usually blended with clay, clad in wood, and sharpened to a taper.
• (optics) An aggregate or collection of rays of light, especially when diverging from, or converging to, a point.
• (geometry) A family of geometric objects with a common property, such as the set of lines that pass through a given point in a projective plane.
• (medicine) A small medicated bougie.