Definition of peta- in English:

peta-

Pronunciation: /ˈpɛtə/

combining form

(Used in units of measurement) denoting a factor of 1015: petabytes

Origin

from pe(n)ta- (see penta-), based on the supposed analogy of tera- and tetra-.

Definition of peta- in:

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Word of the day humoresque
Pronunciation: ˌhjuːməˈrɛsk
noun
a short, lively piece of music