prism /pri-zm/

1. A solid whose ends are similar, equal and parallel polygons, and whose sides are parallelograms (geometry)
2. An object of that shape, esp a triangular prism of glass or the like for resolving light into separate colours
3. A crystal form of three or more faces parallel to an axis (crystallography)
4. (loosely) prismatic colours or spectrum

prismatˈic or prismatˈical adjective

1. Resembling, belonging to or using a prism
2. Built up of prisms (crystallography)
3. (of colours or light) (as though) produced by means of a prism, hence clear and brilliant

prismatˈically adverb

prisˈmoid noun (geometry)

A figure like a prism, but with similar unequal ends

prisˈmoidal adjective

prisˈmy adjective

Prismatic in colour

prismatic colours plural noun

The seven colours into which a ray of white light is refracted by a prism, that is red, orange, yellow, green, blue, indigo and violet

prismatic compass noun

A surveying instrument which by means of a prism enables the compass reading to be taken as the object is sighted

prismatic powder noun

Pebble-powder

triangular, quadrilateral, etc prism noun

A prism whose ends are triangles, quadrilaterals, etc

• riding lights
• riding master
• riding masters
• riding-rhyme
• riding-rhymes
• riding robe
• riding robes
• riding rod
• riding rods
• ridings
• riding school
• riding schools
• riding skirt
• riding skirts
• riding suit
• riding suits
• riding the crest of a wave
• riding the fair
• riding the marches
• riding the stang
• riding whip
• riding whips
• ridotto
• ridottos
• rids