Tet"ra- (?). [Gr. te`tra-, from te`sares, te`ttares, four. See Four.]
1. A combining form or prefix signifying four, as in
tetrabasic, tetrapetalous.
2. (Chem.) A combining form (also used adjectively) denoting four proportional or combining parts of the substance or ingredient denoted by the term to which it is prefixed, as in
tetra-chloride,
tetroxide.
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