How to say "knee" in Arabic
CognateMeaningknee
Arabic · Modern Standard Arabic
رُكْبَة
rukbaרכבה
ركبة
Hebrew · Modern Hebrew
ברך
berekhبِرِخ
How the two words are related
Cognate
Same Semitic root, same meaning — you already know this word.
Arabic root
ر-ك-بHebrew root
ב-ר-כSame three consonants, shuffled: Hebrew ברך is b-r-k, Arabic rukba is r-k-b — an ancient metathesis (Akkadian birku keeps the Hebrew order). The root also pairs baraka 'to kneel' with baraka 'blessing' — and Hebrew has the exact same pair in ברך 'kneel' and ברכה 'blessing'.
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In a phrase
أَلَم فِي الرُّكْبَة
alam fī r-rukbaאלם פי א-רכבהpain in the knee
Plural
رُكَب
rukabרכבbroken plural CuCaC, the regular plural of CuCCa nouns — like غرفة→غرف