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Mackerel vs Undefined - What's the difference?

mackerel | undefined |

As a noun mackerel

is an edible fish of the family scombridae, often speckled or mackerel can be (obsolete) a pimp; also, a bawd.

As an adjective undefined is

lacking a definition or value.

mackerel

English

Etymology 1

From (etyl) maquerel, from a (etyl) source.

Noun

(en-noun)
  • An edible fish of the family Scombridae, often speckled.
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    Derived terms
    * * * * * holy mackerel * horse mackerel * a sprat to catch a mackerel * * mackerel shark * mackerel sky * * Spanish mackerel
    Related terms
    * scombral
    See also
    * tuna

    Etymology 2

    (etyl) maquerel, (etyl) maquereau, from (etyl) .

    Noun

    (en noun)
  • (obsolete) A pimp; also, a bawd.
    • (Halliwell)

    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