cir·cum·fix (sûr'kəm-fĭks') n. An affix consisting of a prefix and a suffix, such as the progressive present marker a- ... -ing in dialectal English I'm a-going or the past participle marker y- ... -t in archaic English yclept. tr.v.
cir·cum·fixed, cir·cum·fix·ing, cir·cum·fix·es To add as a circumfix.