The whitish inner portion of the rind of citrus fruits that is a source of pectin, commonly referred to as the pith.
The fraction of incident light or radiation reflected by a surface or body, commonly expressed as a percentage.
One of the four major stages of the magnum opus, involving purification of the prima materia.
A natural substance that is used to make the ground more suitable for growing plants.
A chemical compound created to have the same effect.