a person who builds.
a person who constructs buildings under contract or as a speculation.
a substance, as an abrasive or filler, added to soaps or other cleaning agents to increase their effectiveness.

1350–1400; Middle English bildere. See build, -er1

underbuilder, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
builder (ˈbɪldə)
1.  a person who builds, esp one who contracts for and supervises the construction or repair of buildings
2.  a substance added to a soap or detergent as a filler or abrasive

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 13c., agent noun from build.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But the master-builder now seems rather worried about the stability of his own construction.
Surprisingly, a bulky muscle-builder physique is not needed to excel at this sport.
In modern terms, this sort of system is best described in terms of sets, using so-called set-builder notation.
My site-builder does not permit me to post mathematical equations.
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