| tetra- | 1. <prefix> 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. Origin: Gr, from, four. (29 Oct 1998) |
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| tetra-amelia | Absence of upper and lower limbs. Origin: tetra-+ G. A-priv. + melos, limb (05 Mar 2000) |
| ethylene diamine tetra acetate | <chemical> A chemical that is used to remove all traces of magnesium and calcium ions from a solution because it binds tightly to them, in order to control unwanted side reactions with these metals during a laboratory process. Acronym: EDTA (11 Nov 1997) |
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| 4-methylumbelliferyl-tetra-N-acetyl-beta-D-chitotetraoside hydrolase | <enzyme> Not identical to human plasma lysozyme Registry number: EC 3.2.1.- Synonym: mu-tact hydrolase (26 Jun 1999) |