combining form Etymology: International Scientific Vocabulary, alteration of octo-; from the fact that 1024 is the eighth power of 103 one septillionth (10 -24 ) part of
YOCTO-
Meaning of YOCTO- in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012