Tetra-
Tetra-
[Greek te`tra-, from te`sares, te`ttares, four. See Four.]
1.
A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.
2.
(Chemistry) 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.