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Etymology · Ancient Greek

ἑπτᾰ́

2 English words descend from Ancient Greek ἑπτᾰ́, most common first.

zepto-In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10⁻²¹ (short scale sextillionth or long scale trilliardth).
zetta-In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 10²¹ (a short scale sextillion or long scale trilliard).