No cognates are known. Maybe irregularly from ع ب ط (ʕ-b-ṭ) or even غ ب ط (ḡ-b-ṭ) or بَطَّ (baṭṭa), but probably ه ب ط (h-b-ṭ) with the armpit understood as the part of the arm where “declivity” or “emaciation” has its place and the regular sound change of the initial consonant known from grammatical elements إِن (ʔin), أَن (ʔan), أَ (ʔa), form IV etc. but also found in e.g. إِبِل (ʔibil) and أُهْبَة (ʔuhba).
إِبْط • (ʔibṭ) m or f (dual إِبْطَانِ (ʔibṭāni), plural آبَاط (ʔābāṭ))
| Singular | basic singular triptote | ||
|---|---|---|---|
| Indefinite | Definite | Construct | |
| Informal | إِبْط ʔibṭ |
الْإِبْط al-ʔibṭ |
إِبْط ʔibṭ |
| Nominative | إِبْطٌ ʔibṭun |
الْإِبْطُ al-ʔibṭu |
إِبْطُ ʔibṭu |
| Accusative | إِبْطًا ʔibṭan |
الْإِبْطَ al-ʔibṭa |
إِبْطَ ʔibṭa |
| Genitive | إِبْطٍ ʔibṭin |
الْإِبْطِ al-ʔibṭi |
إِبْطِ ʔibṭi |
| Dual | Indefinite | Definite | Construct |
| Informal | إِبْطَيْن ʔibṭayn |
الْإِبْطَيْن al-ʔibṭayn |
إِبْطَيْ ʔibṭay |
| Nominative | إِبْطَانِ ʔibṭāni |
الْإِبْطَانِ al-ʔibṭāni |
إِبْطَا ʔibṭā |
| Accusative | إِبْطَيْنِ ʔibṭayni |
الْإِبْطَيْنِ al-ʔibṭayni |
إِبْطَيْ ʔibṭay |
| Genitive | إِبْطَيْنِ ʔibṭayni |
الْإِبْطَيْنِ al-ʔibṭayni |
إِبْطَيْ ʔibṭay |
| Plural | basic broken plural triptote | ||
| Indefinite | Definite | Construct | |
| Informal | آبَاط ʔābāṭ |
الْآبَاط al-ʔābāṭ |
آبَاط ʔābāṭ |
| Nominative | آبَاطٌ ʔābāṭun |
الْآبَاطُ al-ʔābāṭu |
آبَاطُ ʔābāṭu |
| Accusative | آبَاطًا ʔābāṭan |
الْآبَاطَ al-ʔābāṭa |
آبَاطَ ʔābāṭa |
| Genitive | آبَاطٍ ʔābāṭin |
الْآبَاطِ al-ʔābāṭi |
آبَاطِ ʔābāṭi |