| polygalaceous | Of or pertaining to a natural order of plants (Polygalaceae) of which Polygala is the type. (01 Mar 1998) |
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| polygalactia | Excessive secretion of breast milk, especially at the weaning period. Origin: poly-+ G. Gala, milk (05 Mar 2000) |
| polygalacturonan | Plant cell wall polysaccharide consisting predominantly of galacturonic acid. May also contain some rhamnose, arabinose and galactose. Those with significant amounts of rhamnose are termed rhamnogalacturonans. Found in the pectin fraction of the wall. (18 Nov 1997) |
| polygalacturonase | <enzyme> Enzyme that degrades polygalacturonan by hydrolysis of the glycosidic bonds that link galacturonic acid residues. Important in fruit ripening and in fungal and bacterial attack on plants. (18 Nov 1997) |