Ṣidr (gender unknown)
(with) definite article: ?front (i.e. actual 3rd) part of chanter (without fingerholes)
According to Elsner/Jabès, the "front part" (i.e. the actual 3rd part) of the chanter, up to the first finger hole.
Elsner, Jürgen & Jabès, Andrée: Der Arġūl. In: Collaer [et al.]: Nordafrika (1983), p.44 (Elsner [!]).