B2noun
عُرْوَةٌ
ʿurwah
handhold / firm grip / bond
Example
فَمَنْ يَكْفُرْ بِالطَّاغُوتِ وَيُؤْمِنْ بِاللَّهِ فَقَدِ اسْتَمْسَكَ بِالْعُرْوَةِ الْوُثْقَى
faman yakfur biṭ-ṭāghūti wa-yuʾmin billāhi faqadi istamsaka bil-ʿurwati al-wuthqā
Whoever rejects false deities and believes in Allah has grasped the most trustworthy handhold (2:256)
Grammar
Feminine noun. الْعُرْوَةُ الْوُثْقَى (the firmest handhold) is a famous Quranic metaphor. From عَرَا (to occur/attach). وُثْقَى is feminine of أَوْثَقُ (firmest).
Culture
This verse contains the famous phrase 'lā ikrāha fī ad-dīn' (no compulsion in religion) — faith must be a free choice, and that choice is the firmest handhold.