Definition of tetra- in English:

tetra-

Pronunciation: /ˈtɛtrə/
(also tetr- before a vowel)

combining form

1Four; having four: tetramerous tetragram tetrode
2 Chemistry (In names of compounds) containing four atoms or groups of a specified kind: tetracycline

Origin

from Greek, from tettares 'four'.

Definition of tetra- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected