extension ladder

noun
a ladder having two or more sections joined by a sliding mechanism that allows the ladder to be extended to the total length.

Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Do not stand on the three top rungs of a straight, single or extension ladder.
The required information may be stamped into a guide iron on an extension
  ladder or the metal support of a step ladder cap.
The step ladder should not be used as an extension ladder.
The overhead ladder rack carried a thirty five foot aluminum extension ladder.
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