ecto-

prefix

Etymology: Etymology tree Proto-Indo-European *h₁éǵʰ Proto-Indo-European *-s Proto-Indo-European *h₁eǵʰs Proto-Hellenic *eks Ancient Greek ἐκ (ek) Proto-Indo-European *h₁én Proto-Indo-European *h₁éntos Proto-Hellenic *entós Ancient Greek ἐντός (entós) Ancient Greek ἐκτός (ektós)der. English ecto- From Ancient Greek ἐκτός (ektós, “outside”). Sense 2 ("ghost-related") is a reinterpretation of this prefix in the word ectoplasm (“paranormal substance believed to be involved in the materialization of the dead”), for the etymology of which see there.

1. Outside.
2. Ghost-related.

   “ecto-blaster, ectometer”

   “For quotations using this term, see Citations:ecto-.”