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tetracaine - a crystalline compound used in the form of a hydrochloride as a local anesthetic local anaesthetic, local anesthetic, topical anaesthetic, topical anesthetic, local - anesthetic that numbs a particular area of the body
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.