पट्ट

• (Vedic) IPA^(key): /pɐʈ.ʈɐ/,
• (Classical Sanskrit) IPA^(key): /ˈpɐʈ.ʈɐ/,

Probably a Middle Indic form of पत्त्र (pattra, “leaf”), according to Mayrhofer. Turner is skeptical, but gives reluctant support due to the presence of the Dardic form *पट्ट (paṭṭa), as well as the fact that many descendants of पत्त्र (pattra) do mean "metal plate".

पट्ट • (paṭṭa) stem, m

1. a slab, tablet (for painting or writing upon)
   1. (especially) a copper plate for inscribing royal grants or orders
2. the flat or level surface of anything

• Dardic:
  • Kashmiri:

    Arabic script: پَٹَ (paṭa), پۆٹُ (poṭu)

    Devanagari script: पट (paṭ), पॊटु (poṭu)

• Pali: paṭṭa
• Prakrit: 𑀧𑀝𑁆𑀝 (paṭṭa) (see there for further descendants)

Likely a variant of पट (paṭa, “garment”).

पट्ट • (paṭṭa) stem, m

1. cloth
2. coloured or fine cloth, woven silk
3. an upper or outer garment
4. a place where 4 roads meet
5. a bandage, ligature, strip, fillet (of cloth, leather, etc.)
6. a frontlet, turban (of 5 kinds, namely those of kings, queens, princes, generals, and the प्रसाद-पट्टस्, or turban of honour), tiara, diadem

• Dardic:
  • Kashmiri:

    Arabic script: پَٹھ (paṭh), پۆتُ (potu)

    Devanagari script: पठ (paṭh), पोटु (pōṭu)

  • Phalura:

    Latin script: pátaṛ, páataṛ

    Arabic script: پٹڑ

• Pali: paṭṭa, paṭṭaka, paṭṭikā
• Prakrit: 𑀧𑀝𑁆𑀝 (paṭṭa) (see there for further descendants)

Borrowed terms

• → Malayalam: പട്ട് (paṭṭŭ)
• → Tamil: பட்டு (paṭṭu)
• → Telugu: పట్టు (paṭṭu)

• Monier Williams (1899) “पट्ट”, in A Sanskrit–English Dictionary, , new edition, Oxford: At the Clarendon Press, →OCLC, pages 579/2-3.
• Mayrhofer, Manfred (2001) Etymologisches Wörterbuch des Altindoarischen [Etymological Dictionary of Old Indo-Aryan]‎ (in German), volume 3, Heidelberg: Carl Winter Universitätsverlag, pages 299-300
• Turner, Ralph Lilley (1969–1985) “paṭṭa”, in A Comparative Dictionary of the Indo-Aryan Languages, London: Oxford University Press