pignus

Some refer it to Proto-Indo-European *peyǵ- or *peyḱ-; others refer it to Proto-Indo-European *peh₂ǵ- (“to fasten, fix”); its meaning perhaps being "something pinned/fixed/retained (as pledge)".

pignus n (genitive pignoris); third declension

Third-declension noun (neuter, imparisyllabic non-i-stem).

More information singular, plural ...

Insular Romance:
- Sardinian: pinnus (Logudorese)
Italo-Romance:
- Italian: pegno
- Sicilian: pignu
Gallo-Italic:
- Piedmontese: pegn
Gallo-Romance:
- Old Occitan: penh
Ibero-Romance:
- Old Galician-Portuguese: pennor
  - Portuguese: penhor
- Old Spanish: peños
  - Spanish: peño
Borrowings:
- → Albanian: peng
- → English: pignus
From the plural pignora:
- Italo-Romance:
  - Italian: pegnora (pl.) (archaic)
- Ibero-Romance:
  - Old Spanish: péñora, peñdra, pendra
    - Spanish: prenda
    - → Old Galician-Portuguese: prenda
      - Portuguese: prenda

“pignus”, in Charlton T. Lewis and Charles Short (1879), A Latin Dictionary, Oxford: Clarendon Press
“pignus”, in Charlton T. Lewis (1891), An Elementary Latin Dictionary, New York: Harper & Brothers
"pignus", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
“pignus”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.
“pignus”, in Harry Thurston Peck, editor (1898), Harper’s Dictionary of Classical Antiquities, New York: Harper & Brothers
“pignus”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

Latin