planum

English

Etymology

From Latin plānum (“level ground, plain”).

Noun

planum (plural plana)

1. (anatomy) any flat surface
2. (astronomy) a plain or plateau on a moon or planet

Derived terms

• planum temporale

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Latin

Etymology

From plānus (“flat, even, level”).

Pronunciation

• (Classical Latin) IPA^(key): /ˈplaː.num/, [ˈpɫ̪äːnʊ̃ˑ]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈpla.num/, [ˈpläːnum]

Noun

plānum n (genitive plānī); second declension

1. a plain, level ground

Declension

Second-declension noun (neuter).

Case	Singular	Plural
Nominative	plānum	plāna
Genitive	plānī	plānōrum
Dative	plānō	plānīs
Accusative	plānum	plāna
Ablative	plānō	plānīs
Vocative	plānum	plāna

Related terms

• plānē
• plānus

 

Descendants

• English: plain, plane
• → Galician: plano
• Old French: plain
  • → Dutch: plein
  • → Middle English:
    • English: plain
    • Scots: plain
• Old Galician-Portuguese: chão
  • Galician: chan
  • Portuguese: chão
• Old Spanish:
  • Spanish: llano
• → Portuguese: plano
• → Spanish: plano

References

• van der Sijs, Nicoline, editor (2010), “plein”, in Etymologiebank, Meertens Institute
• “planum”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• planum 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)
• planum in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
• Carl Meißner, Henry William Auden (1894) Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • to demonstrate, make a thing clear: aliquid planum facere (Ad Herenn. 2. 5)