infravisible

English

From infra- +‎ visible.

infravisible (not comparable)

Partially or nearly visible.
- 1935, American Journal of Syphilis, Gonorrhea and Venereal Diseases:
  The infravisible stage is succeeded by other transition forms before the typical spirochetes develop.
- 1936, Venereal disease information, page 215:
  These changes with the new formation of □vessels that accompany them seem to favor the development of the infravisible virus into the form of spirochetes.
- 2013, Rudolphe Durand, The Pirate Organization: Lessons from the Fringes of Capitalism:
  […] the opening up of new spaces is only possible in infravisible limbo or outer space: biopiracy, nanopiracy, and space piracy are arising or will arise.
At the infrared end of the spectrum, lower in frequency than light visible to humans.
Antonym: ultravisible
(fantasy) Visible by means of infravision.