\lˈaktə͡ʊz], \lˈaktəʊz], \l_ˈa_k_t_əʊ_z]\
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By William Dodge Lewis, Edgar Arthur Singer
By Willam Alexander Newman Dorland
Syn.: milk sugar, galactosaccharum, saccharum lactis. C12H22O11+H2O, a compound carbohydrate (hexobiose) present in milk; also present at times in the urine of pregnant women. Upon hydrolysis with dilute acids or lactase one molecule of l. is converted into one molecule of d.-glucose and one molecule of d.-galactose. It responds to the ordinary reduction tests, which are characteristic of glucose, such as the Fehling test, Nylander's test, etc. But it will not ferment with yeast cells, a property which is made use of to distinguish it from glucose. With phenylhydrazin it forms a crystalline phenyl-lactosazone. [Lat.]
By Smith Ely Jelliffe
Word of the day
- A third and imperfect eruption of teeth, occurring very rarely as an anomaly adult life or even in beginning old age.