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.

κάθετος‘perpendicular’

Greek. – Grammar: adj used as noun.

References: Alm. Heiberg: I.10, 39:12; I.13, 71:4
Translated into:
Arabic: عمود...قائم [Alm. MS Leiden: f. 7r]
Arabic: عمود [Alm. MS Tunis: ]
Modern translations:
English: perpendicular [Alm. Toomer: 52]
Synonyms:
ὀρθός[Alm. Heiberg: I.12, 65:9]