se·rir 
(sə-rîr)
(sə-rîr)n.
An area of desert from which the wind has removed most of the fine-grained sand, leaving a hard, flat surface strewn with rounded pebbles.
[Of North African origin; akin to Tamahaq (Tuareg Berber language of southern Algeria, dialect of the Ahaggar Mountains) asrir.]