Originally a noun of place meaning “place of riding”, from the verb رَكِبَ (rakiba, “to ride”). Cognate with Hebrew מֶרְכָּבָה (merkaḇa, “chariot”), Ge'ez መርከብ (märkäb), Classical Syriac ܡܰܪܟܰܒܬܳܐ.
Practice speaking and memorizing "مركب" and many other words and sentences in Arabic.