prefix Etymology: Latin, through, throughout, thoroughly, detrimental to, from per throughout ; thoroughly , 2. containing the largest possible or a relatively large proportion of a (specified) chemical element , containing an element in its highest or a high oxidation state
PER-
Meaning of PER- in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012