PAL

Ptolemaeus Arabus et Latinus

_ (the underscore) is the placeholder for exactly one character.
% (the percent sign) is the placeholder for no, one or more than one character.
%% (two percent signs) is the placeholder for no, one or more than one character, but not for blank space (so that a search ends at word boundaries).

At the beginning and at the end, these placeholders are superfluous.

nychthemeron‘day and night’

English

References: PH Hamm: I.4:3, 47:18
Translation of:
Greek: νυχθήμερον [Alm. Heiberg: I.8, 30:6. – PH Heiberg: I.4:3, 76:8]
Synonyms:
day and night[Alm. Toomer: 47]