addition compound

ad·di·tion com·pound

1. strictly, a complex of two or more complete molecules in which each preserves its fundamental structure and no covalent bonds are made or broken (for example, hydrates of salts, adducts);

2. loosely, association of acids with basic organic compounds (for example, amines with HCl);

3. more loosely, addition of two molecules without the loss of any atom but resulting in formation of new covalent bonds (for example, CH₂=CH₂ + Br₂ → BrCH₂-CH₂Br).

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