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a. The hue of the long-wave end of the visible spectrum, evoked in the human observer by radiant energy with wavelengths of approximately 630 to 750 nanometers; any of a group of colors that may vary in lightness and saturation and whose hue resembles that of blood; one of the additive or light primaries; one of the psychological primary hues.

b. A pigment or dye having a red hue.

c. Something that has a red hue.

2.

a. often Red A Communist.

b. A revolutionary activist.

1. A reproduction of the form of a person or object, especially a sculptured likeness.

2. Physics An optically formed duplicate, counterpart, or other representative reproduction of an object, especially an optical reproduction formed by a lens or mirror.

3. One that closely or exactly resembles another; a double: He is the image of his uncle.

4. a. The opinion or concept of something that is held by the public. b. The character projected to the public, as by a person or institution, especially as interpreted by the mass media. 5. A personification of something specified: That child is the image of good health. 6. A mental picture of something not real or present.

7. a. A vivid description or representation. b. A figure of speech, especially a metaphor or simile. c. A concrete representation, as in art, literature, or music, that is expressive or evocative of something else: night as an image of death.

8. Mathematics A set of values of a function corresponding to a particular subset of a domain.

9. Computer Science An exact replica of the contents of a storage device, such as a hard disk, stored on a second storage device, such as a network server.

10. Obsolete An apparition.