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Atrium vs Undefined - What's the difference?

atrium | undefined |

As a noun atrium

is atrium (a square hall lit from above).

As an adjective undefined is

lacking a definition or value.

atrium

English

(wikipedia atrium)

Noun

(en-noun)
  • (architecture) A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  • (architecture) A square hall lit by daylight from above, into which rooms open at one or more levels.
  • (anatomy) Any enclosed sexine and nexine layers, widening toward the interior of the grain.
  • * {{quote-book, 1965, Janet Kircher Warter, Palynology of a Lignite of Lower Eocene (Wilcox) Age from Kemper County citation
    • , passage=Nexine 0.5? thick, separating from the sexine about 5? from the pore and forming a deep, well-defined atrium .}}

    Synonyms

    * (room in Roman homes) cavaedium

    Derived terms

    * atrial * atriate English nouns with irregular plurals ----

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined