Tetrasulfide

Part of speech: noun

Definitions

1. A compound containing four sulfur atoms bonded together or bonded to other elements in a molecule
2. A chemical substance formed by combining four atoms or groups of sulfur with another element or radical
3. A molecular structure that incorporates four sulfur atoms as a key component of its chemical composition

Etymology: "Tetrasulfide" is a technical chemistry coinage, built in English from two parts that each carry a long history. The first part, "tetra-", comes from Ancient Greek "tetra-", the combining form of "téssares," meaning "four." The second part, "sulfide," combines "sulf(ur)," from Latin "sulphur" (passed through Anglo-Norman "sulfre" and Middle English), with the suffix "-ide," itself built on a Latin "-idus" ending. Chemists use the suffix "-ide" to name binary compounds, so "sulfide" denotes a compound of sulfur with another element. Put together, "tetrasulfide" means a compound containing four sulfur atoms in a chain or unit, with the prefix counting the sulfur atoms much as "tetra-" counts parts in other chemical names. The word was formed in English by simply attaching the Greek numerical prefix to the established term "sulfide," so it is a modern scientific construction rather than something used by the ancient Greeks or Romans, who had no concept of sulfur compounds in this sense.