aṅguṣṭhya

 In Sanskrit, "aṅguṣṭhya" (अङ्गुष्ठ्य) primarily refers to something that belongs to the thumb, most specifically the thumb or thumb-nail.

Definition and Etymology

The term "aṅguṣṭhya" is derived from aṅgula, meaning "finger" or "digit," and 

specifically refers to the thumb in classical usage 

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It functions as a masculine noun or an adjective in Sanskrit grammar:

• As a noun, it denotes the thumb or thumb-nail.
• As an adjective, it implies pertaining to the thumb or something located 
• on/associated with the thumb 

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The word is a classical term appearing in Sanskrit scriptures, Vedic texts, 

and Ayurvedic or yogic literature 

Yogawiki

. Its etymological roots trace 

back to Proto-Indo-Iranian Hangúštʰas and Proto-Indo-European 

h₂eng- meaning "joint," showing cognates in languages like Persian (angošt) 

and Avestan (aṇgušta) 

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Usage and Derived Forms

• Grammatical forms: aṅguṣṭhyaḥ (nominative singular masculine),
• aṅguṣṭhyaṃ (accusative singular), with various cases following 
• standard masculine a-stem declensions 

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• Derived forms include aṅguṣṭhikā (feminine form) and other terms
• denoting size or association with the thumb 

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• In yoga, Ayurveda, and Sanskrit literature, the word is often referenced 
• in anatomical descriptions, ritual gestures (mudras), and measurements
• based on finger/thumb length 

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Summary

Aṅguṣṭhya literally means "thumb" or "that which belongs to the thumb",

including the thumb-nail, and is widely attested in Sanskrit dictionaries, 

classical texts, and related South Asian languages 

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It forms the root for various derived words and has influenced terms in

Prakrits, Hindi, and other Indian languages.