mĕrīdĭātĭo, ōnis, f. [meridio],
a midday nap, siesta (class.): et lucubrationes detraxi, et meridiationes addidi, Cic. Div. 2, 68, 142.
merīdiātiō ōnis, f meridio, a mid-day nap, siesta . ...
An Elementary Latin Dictionary