dissĕrēnasco, āvi, 3, v. inch. n. impers. [dissereno],
to clear up , grow clear : cum undique disserenāsset, Liv. 39, 46, 4.
disserenasco āvī, —, āre, inchimpers. dis + sereno, to clear up, grow clear : cum undique disseren...
An Elementary Latin Dictionary