- tamûrt "land" > tmu:râw (Contrast Kabyle tamurt > timura, Tumzabt tamuṛt > timuṛa; compare Ghadamsi tămmurt > tmuro)
- tanâst "key" > tnisâu (Contrast Tumzabt tnast > tinisa; compare Ghadamsi tonest > təniso)
- talîlt "terrace" > tli:lâu
The dropping of final semivowels in Northern Berber is well-known, but I had been wondering where the -o in the Ghadamsi plurals came from. I guess now I know. What I don't get yet is why this set of plurals ends in -a/aw/o in any case, rather than the regular feminine plural -in.
For more on this language, see Umberto Paradisi, "El-Fogaha, oasi berberofona del Fezzân", Roma:Bardi 1961.
PS: A belated Eid Mubarak to everyone!