Why is the ninth month called September?
late 14c., from Latin pigmentum "coloring matter, pigment, paint," figuratively "prnament," from stem of pingere "to color, paint" (see paint (v.)). Variants of this word could have been known in Old English (e.g. 12c. pyhmentum). As a verb from 1900. Related: Pigmented; pigmenting.
pigment pig·ment (pĭg'mənt)
A substance used as coloring.
Dry coloring matter, usually an insoluble powder to be mixed with water, oil, or another base to produce paint and similar products.
A substance that produces a characteristic color in tissue.
A medicinal preparation applied to the skin like paint.