atto-

a combining form that enters into compounds denoting a unit one-quintillionth (10−18) the size of the unit named by the stem.

Origin of atto-

< Danish or Norwegian att(en) eighteen + -o-

Words nearby atto-

attius, attleboro, attlee, attn, attn., atto-, attolaser, attophysics, attorn, attorney, attorney general

British Dictionary definitions for atto-

atto-

prefix

denoting 10 –18 attotesla Symbol: a

Word Origin for atto-

from Norwegian, Danish atten eighteen

Medical definitions for atto-

atto-

pref.

One quintillionth (10-18):attometer.