Definition of yocto- in English:

yocto-

Pronunciation: /ˈjɒktəʊ/

combining form

(Used in units of measurement) denoting a factor of 10−24: yoctojoule

Origin

adapted from octo-, on the pattern of combining forms such as peta- and exa-.

Definition of yocto- in:

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Word of the day flagitious
Pronunciation: fləˈjiSHəs
adjective
(of a person or their actions) criminal; villainous