D defs.my
Entry 2 senses Webster, 1913

liminal

· IPA /ˈlɪmən(ə)l/
01 adj. of or pertaining to a limen, especially a sensory threshhold.
  1. 1.
    of or pertaining to a limen, especially a sensory threshhold.
  2. 2.
    marginally perceptible.