What does halide mean?
A halide is a technical chemistry term for a compound in which a halogen—a group containing fluorine, chlorine, bromine, iodine, or astatine—is combined with another element. The most familiar examples are ionic salts such as sodium chloride and silver bromide, although “halide” may also denote a negatively charged halogen ion. In photography, light-sensitive silver halide crystals form the image layer; in lighting, metal halide sources produce intense white light. The term is consequently associated with photography, lighting, materials science, and laboratory chemistry rather than everyday speech. Its derivation is equally characteristic of scientific English: it combines “halogen,” ultimately from Greek roots associated with salt, with the chemical suffix “-ide.” A halide is especially useful when precision matters, since it identifies a class of compounds by their halogen content rather than by one particular element.
nounA chemical compound in which a halogen is combined with another element, especially a metal, metalloid, or other electropositive element. In an ionic context, the term may also refer to a negatively charged halogen ion.
- A chemical compound containing a halogen, especially a binary compound formed by a metal, metalloid, or other electropositive element with a halogen.
- A negatively charged ion derived from a halogen atom, such as chloride, bromide, iodide, or fluoride.
"Silver halide crystals on the film reacted with light to form the photographic image."
"The corrosion of the metal produced a halide layer that initially protected the underlying surface."
"Metal halide lamps are valued for producing intense white light."
The regular plural is used when referring to different halide compounds, ions, or materials.
"Several halides were tested for their ability to conduct electricity."
From Greek for “salt” to the light-sensitive crystals behind photography, halide carries the element that makes many salts and specialized technologies possible.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does halide come from?
Halide was formed in early nineteenth-century English scientific usage from halogen and the chemical suffix -ide. Halogen comes through French and German from Greek hals, “salt,” and genos, “kind” or “producing,” reflecting the historical association of these substances with salts. The same root underlies related English terms such as halogenate, halogenation, and halogenous.
How halide is actually used
This is a specialized scientific term used chiefly in chemistry, materials science, mineralogy, photography, and lighting. It is also used attributively in compound terms such as “metal halide” and “silver halide.”
Easily confused with halide
A halogen is one of the chemical elements fluorine, chlorine, bromine, iodine, or astatine, whereas a halide is a compound containing a halogen or an ion derived from one.