Definition of Rub' al-Khali in English:

Rub' al-Khali

Syllabification: Rub' al-Kha·li
Pronunciation: /ˌro͝ob alˈkälē, älˈKHälē
 
/
A vast desert in the Arabian peninsula that extends from central Saudi Arabia south to Yemen and east to the United Arab Emirates and Oman. It is also known as the Great Sandy Desert and the Empty Quarter.

Definition of Rub' al-Khali in:

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards