Crossword clue: a combining form signifying without, outside, external.
2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
ect
3 letters
web-def
the administration of a strong electric current that passes through the brain to induce convulsions and coma
A combining form signifying without, outside, external.