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.

the chord of arc AB‘chord’

English

References: Plan. Sidoli+Berggren: ?
Translation of:
Arabic: الخطّ المستقيم الذي يوتر قوس اب  [Plan. Sidoli+Berggren: 109(2), 117, 119, 135, 137, 148, 150, 159, 160]
Synonyms:
chord[Alm. Toomer: 54]