para-aminobenzoic acid

para-aminobenzoic acid

[par-uh-uh-mee-noh-ben-zoh-ik, -am-uh-noh-]
noun Chemistry, Biochemistry.
part of the folic acid molecule, a white or yellowish, crystalline, slightly water-soluble solid, C 7 H 7 NO 2 , the para isomer of aminobenzoic acid: used chiefly in the manufacture of dyes and pharmaceuticals and in sunscreens to protect against ultraviolet light. Abbreviation: PABA

Origin:
1905–10; para-1 + amino- + benzoic acid

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Collins
World English Dictionary
para-aminobenzoic acid
 
n
biochem an acid present in yeast and liver: used in the manufacture of dyes and pharmaceuticals. Formula: C6H4(NH2)COOH

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

para-aminobenzoic acid par·a-a·mi·no·ben·zo·ic acid (pār'ə-ə-mē'nō-běn-zō'ĭk, -ām'ə-)
n.
PABA.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
para-aminobenzoic acid   (pār'ə-ə-mē'nō-běn-zō'ĭk, -ām'ə-)  Pronunciation Key 
See PABA.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

para-aminobenzoic acid

a vitamin-like substance and a growth factor required by several types of microorganisms. In bacteria, PABA is used in the synthesis of the vitamin folic acid. The drug sulfanilamide is effective in treating some bacterial diseases because it prevents the bacterial utilization of PABA in the synthesis of folic acid.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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