lactosurian.

/laktəʊˈsjʊərɪə/Etymology: quasi-Latin, < lactose n. + Greek οὖρον urine + -ia suffix1.
Pathology.
1881 A. Flint (ed. 5) 73 Milk-sugar is present in the urine of females during lactation. This condition is lactosuria.
This entry has not yet been fully updated (first published 1901; most recently modified version published online June 2018).