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.

Καρκίνος‘Cancer’

Greek. – Grammar: n.

References: Alm. Heiberg: II.7, 124:10; II.8, 134-140; VII.94-97
Translated into:
Arabic: سرطان [Alm. MS Leiden: f. 21r.8; f. 23r-24r. – Alm. MS Tunis: ; 27b.22; 30]
Modern translations:
English: Cancer [Alm. Toomer: 94; 100-103; 366]