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.

interlunium ‘the conjunction of Sun and Moon’

Latin

References: Pontano: XXXIVc. 5
Translation of:
Greek: σύνοδος [Pontano: p. 329]
Synonyms:
coniunctio[Alm. minor Zepeda: IV.3]