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Blech vs Undefined - What's the difference?

blech | undefined |

As a noun blech

is sheet (out of metal).

As an adjective undefined is

lacking a definition or value.

blech

English

Etymology 1

Interjection

(en interjection)
  • (slang) An imitation of the sound of gagging, used to express disgust or disdain.
    • ''Blech ! Look at all the garbage people add to the online dictionary!

    Verb

    (es)
  • (slang) To have the vomiting reflex triggered.

    • See also

    * gag * argh

    Etymology 2

    (wikipedia blech) From (etyl) . Related to (etyl) (m).

    Noun

    (en noun)
  • (lb) A metal sheet used to cover stovetop burners on Shabbat to allow food to be kept warm without violating the prohibition against cooking.

    • Anagrams

    *

    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