OCTO-


Meaning of OCTO- in English

octo- BrE AmE , oct- /ɒktəʊ $ ɑːktoʊ/ prefix

eight, or having eight:

octagon (=a shape with eight sides)

octopus (=a sea creature with eight arms)

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.