plumb

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Adjective[change]

Positive
plumb

Comparative
none

Superlative
none

  1. truly vertical
    if an endlessly long line was plumb, then it would go through the center of the Earth

Adverb[change]

Positive
plumb

Comparative
none

Superlative
none

  1. in a truly vertical direction
    same as the adjective meaning

Noun[change]

Singular
plumb

Plural
none

  1. a heavy piece of lead attached to string used to tell whether a line is truly vertical