Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mictus, ūs, m. [mingo], a making water, urinating (post-class.): sanguinis mictus, Cael. Aur. Tard. 5, 3, 59; 2, 1, 12.
mingo, inxi, inctum and ictum, 3, v. a. [root mig, whence also meio; cf. also the Greek ὀ μιχέω], to make water, to void urine: in me veniant mictum atque cacatum, Hor S 1, 8, 38: urina mingitur, Cels. 4, 20: ut quantum bibisset, tantum mingeret, Vop ap Bon. 14; Juv. 3, 107.
In mal. part., Cat. 67, 30.