English
intraterrestrial
From intra- + terrestrial.
Formed from intra- + terrestrial
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁énteros ‘inside, within’
Latin *interus
Latin intrā ‘within’
English intra-
Middle English terrestrialle
English terrestrial
Today it means
noun a microbe which lives deep underground
Language periods are conventional ranges, not dates for this word.
Etymograph / intraterrestrial