intraterrestrial

English

Etymology

From intra- +‎ terrestrial.

Noun

intraterrestrial (plural intraterrestrials)

1. (microbiology) a microbe which lives deep underground
2. (ufology) any of a race of sapient beings who live inside the Earth and operate UFOs

Adjective

intraterrestrial (not comparable)

1. (microbiology) Living deep underground.