Planck

Borrowed from German Planck.

• (Received Pronunciation)
  • IPA^(key): /ˈplæŋk/, [ˈpʰl̥æŋk]
  • Rhymes: -æŋk
• (General American)
  • IPA^(key): /ˈplɑ(ː)ŋk/, [ˈpʰl̥ɑŋk]
  • Rhymes: -ɑ(ː)ŋk
• Hyphenation: Planck
• Homophones: plonk (US), plank (UK)

Planck

1. A surname from German.
   • 2023 October 9, Dennis Overbye, “The Science Nobel Winners Were Short and Fast”, in The New York Times‎^[1], archived from the original on 12 October 2023:

     As Dr. Feynman noted, there are still shorter scales of time and distance to go before we reach the ultimate limits imposed by quantum physics: the Planck length, 10^-33 of a centimeter, and the Planck time, 10^-43 of a second. Both are named for the German physicist Max Planck, who made the breakthrough that led to quantum mechanics.

Planck (plural Plancks)

1. (physics) Used attributively in the names of various units, formulae etc. first devised or worked on by the German physicist Max Planck (1858–1947), chiefly in the realm of quantum theory. [from 20th c.]
   • 2023 October 9, Dennis Overbye, “The Science Nobel Winners Were Short and Fast”, in The New York Times‎^[2], archived from the original on 12 October 2023:

     As Dr. Feynman noted, there are still shorter scales of time and distance to go before we reach the ultimate limits imposed by quantum physics: the Planck length, 10^-33 of a centimeter, and the Planck time, 10^-43 of a second. Both are named for the German physicist Max Planck, who made the breakthrough that led to quantum mechanics.

2. (physics) A Planck unit.