Perhaps from Proto-Semitic *rukba- (“knee”), metathetic form of Proto-Semitic *birk- (“knee”), whence also the root ب ر ك (b r k). Ehret (1995) derives this word from Proto-Afroasiatic *ruk- (“to bend”) instead.
رُكْبَة • (rukba) f (dual رُكْبَتَانِ (rukbatāni), plural رُكَب (rukab) or رُكْبَات (rukbāt))
| singular | singular triptote in ـَة (-a) | ||
|---|---|---|---|
| indefinite | definite | construct | |
| informal | رُكْبَة rukba |
الرُّكْبَة ar-rukba |
رُكْبَة rukbat |
| nominative | رُكْبَةٌ rukbatun |
الرُّكْبَةُ ar-rukbatu |
رُكْبَةُ rukbatu |
| accusative | رُكْبَةً rukbatan |
الرُّكْبَةَ ar-rukbata |
رُكْبَةَ rukbata |
| genitive | رُكْبَةٍ rukbatin |
الرُّكْبَةِ ar-rukbati |
رُكْبَةِ rukbati |
| dual | indefinite | definite | construct |
| informal | رُكْبَتَيْن rukbatayn |
الرُّكْبَتَيْن ar-rukbatayn |
رُكْبَتَيْ rukbatay |
| nominative | رُكْبَتَانِ rukbatāni |
الرُّكْبَتَانِ ar-rukbatāni |
رُكْبَتَا rukbatā |
| accusative | رُكْبَتَيْنِ rukbatayni |
الرُّكْبَتَيْنِ ar-rukbatayni |
رُكْبَتَيْ rukbatay |
| genitive | رُكْبَتَيْنِ rukbatayni |
الرُّكْبَتَيْنِ ar-rukbatayni |
رُكْبَتَيْ rukbatay |
| plural | basic broken plural triptote; sound feminine plural | ||
| indefinite | definite | construct | |
| informal | رُكَب; رُكْبَات rukab; rukbāt |
الرُّكَب; الرُّكْبَات ar-rukab; ar-rukbāt |
رُكَب; رُكْبَات rukab; rukbāt |
| nominative | رُكَبٌ; رُكْبَاتٌ rukabun; rukbātun |
الرُّكَبُ; الرُّكْبَاتُ ar-rukabu; ar-rukbātu |
رُكَبُ; رُكْبَاتُ rukabu; rukbātu |
| accusative | رُكَبًا; رُكْبَاتٍ rukaban; rukbātin |
الرُّكَبَ; الرُّكْبَاتِ ar-rukaba; ar-rukbāti |
رُكَبَ; رُكْبَاتِ rukaba; rukbāti |
| genitive | رُكَبٍ; رُكْبَاتٍ rukabin; rukbātin |
الرُّكَبِ; الرُّكْبَاتِ ar-rukabi; ar-rukbāti |
رُكَبِ; رُكْبَاتِ rukabi; rukbāti |
رَكَبَة • (rakaba) m pl
ركبة • (rukba) f (dual ركبتين (rkubtayn), plural ركاب (rkāb) or ركبات (rukbāt) or ركابي (rkābi))
ركبة • (rukbe) f (plural ركب (rukab) or ركاب (rkāb))