The Collaborative International Dictionary
Camaieu \Ca*ma"ieu\, n. [F.; of unknown origin. Cf. Cameo.]
A cameo. [Obs.]
--Crabb.(Fine Arts) Painting in shades of one color; monochrome.
--Mollett.
Wiktionary
n. (context arts English) A style of painting in a small range of monochrome colours
Wikipedia
Camaïeu (also called en camaïeu) is a technique that employs two or three tints of a single color, other than gray, to create a monochromatic image without regard to local or realistic color. When a picture is monochromatically rendered in gray, it is called grisaille; when in yellow, cirage.
The term is also applied to monochrome painting in enamels. This technique uses a buildup of white enamel to create highlights and light areas. However, instead of using a black background, as in grisaille, transparent enamel is laid in first, beneath the whites. This technique is frequently used on snuffboxes, watches and medallions.
Camaïeu can also refer, following the French usage, to chiaroscuro woodcut prints that imitate highlighted drawing on tinted paper. However, the correct term in English for these is chiaroscuro woodcuts.
This French word once was synonymous with cameo, but its meaning became restricted in the early eighteenth century.
Camaïeu is also a registered trade mark of a manufacturer.
Camaïeu is a French retail clothing company which manufactures and sells its own collections of women's clothing.