How to Pronounce "Deictic"

Solution 1:

It's number 1, /'dayktɪk/. And the noun is deixis /'dayksɪs/.
A person saying /'deyktɪk/ would likely be taken for someone who didn't know the term.

See here for Charles Fillmore's Deixis Lectures:

  • Deixis Lecture 1: "May We Come In?"
  • Deixis Lecture 2: Space
  • Deixis Lecture 3: Time
  • Deixis Lecture 4: Deixis 1
  • Deixis Lecture 5: Coming and Going
  • Deixis Lecture 6: Deixis 2