
A hydrotrope is a compound that solubilises hydrophobic compounds in aqueous solutions. Typically, hydrotropes consist of a hydrophilic part and a hydrophobic part (like surfactants) but the hydrophobic part is generally too small to cause spontaneous self-aggregation.Hydrotropes do not have a critical concentration above which self-aggregation `....
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http://en.wikipedia.org/wiki/Hydrotrope

• (n.) A device for raising water by the direct action of steam; a pulsometer.
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http://thinkexist.com/dictionary/meaning/hydrotrope/

A chemical substance which causes other organic substances that are only slightly soluble to become more easily dissolved. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973
Hy'dro·trope noun [
Hydro- , 1 + Greek ... to turn, direct.] A device for raising water by the direct action of steam; a pulsometer.
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http://www.encyclo.co.uk/webster/H/78

hydrotrope, hydrotropic A compound that increases the aqueous solubility of various slightly soluble organic compounds.
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http://www.wordinfo.info/words/index/info/view_unit/1009/14

A substance, such as sodium xylene sulfonate, which increases the aqueous solubility of surfactants and other substances. Hydrotropes are sometimes used to reduce a systems viscosity. (see RFF 705.10.08 - HYDROTROPES).
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https://www.encyclo.co.uk/local/22437
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