define tetra
Tetra-. a combining form or prefix signifying four, as in tetrabasic, tetrapetalous. Tetra-. 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.
Webster Dictionary(0.00 / 0 votes)Rate this definition: 1  Tetra-. a combining form or prefix signifying four, as in tetrabasic, tetrapetalous. 2  Tetra-. 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.