adj, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   An organism that did not originate on Earth.

Adjective

1. 1
   Not terrestrial. not-comparable

Synonyms

All synonyms

alien

Etymology

From non- + terrestrial.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.