Standard Lemma guide

ecto-

prefix · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /ɛktoʊ-/
  • US: Recorded audio is listed in the source snapshot.

1

prefix

Meaning 1

Outside.

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: out-, ex-, exo-

Antonyms: in-, intra-, en-/em-/im-, end-/endo-/ento-

2

prefix

Meaning 2

Ghost-related.

Definition source: English Wiktionary via Wiktextract

Usage: morpheme

Examples

  • ecto-blaster, ectometer
  • For quotations using this term, see Citations:ecto-.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

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.

Across languages

Translations

9 source translations are retained for this English entry.

  • Catalan: ecto- — Translations
  • Finnish: ekto- — Translations
  • French: ecto- — Translations
  • German: ekto- — Translations
  • Greek: εκτο- (ekto-) — Translations
  • Italian: ècto- — Translations
  • Polish: ekto- — Translations
  • Portuguese: ecto- — Translations
  • Spanish: ecto- — Translations