pat

root. *open, [ᴱ√] open, wide, spreading

An unglossed root in The Etymologies of the 1930s with derivatives like ᴹQ. panta- “to unfurl, spread out, open” and N. panna- “to open, enlarge”, along with ᴹQ. panta “open” and N. pann “wide” (Ety/PAT). It seems to be a later iteration of ᴱ√PATA² or ᴱ√PṆTṆ from the Qenya Lexicon of the 1910s glossed “open, spread out, show” with very similar derivatives like ᴱQ. panta “open, wide, spreading” and ᴱQ. panta- “open, unfold, spread” (QL/72). In Tolkien’s later writings, ✱√PAT seems to mean “step” or “walk”; see that entry for details.

Neo-Eldarin: Despite the later shift in meaning for √PAT, I think this earlier sense “open (wide)” can be salvaged by assuming that form of the root is actually ✱√PANAT or ✱√PANTA, which is consistent with most of its derivatives. For the non-verbal senses of “open”, I think √LAT is generally better.

Derivatives

• ᴹ✶pantā “open” ✧ Ety/PAT
  • ᴹQ. panta “open, open, [ᴱQ.] wide, spreading” ✧ Ety/PAT
• ᴹ✶patnā “wide” ✧ Ety/PAT
  • N. pann “wide” ✧ Ety/PAT
• ᴺQ. patil “key”
• ᴹQ. panta- “to unfurl, spread out, open” ✧ Ety/PAT
• ᴺS. padol “key”
• N. panna- “to open, enlarge” ✧ Ety/PAT
• ᴺS. patha- “to reveal, show”