Bible Dictionaries
Tetra

Webster's Dictionary

(1):

A combining form or prefix signifying four, as in tetrabasic, tetrapetalous.

(2):

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.

Bibliography Information
Webster, Noah. Entry for 'Tetra'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/tetra.html. 1828.