andū

 The most accurate reconstruction is that andū is a rare or dialectal Sanskrit form meaning “a kind of insect or worm”, and its Devanagari spelling is अन्दू.

✅ Is andū an attested classical Sanskrit word?

The supplied dictionary portals do not list andū directly

Sanskrit Dictionary+3

. This means the word is not a common classical Sanskrit lexeme found in major dictionaries such as Monier–Williams or Apte.

However, based on Sanskrit phonology and parallels in Prakrit and Indo‑Aryan languages, andū aligns with a small family of words referring to tiny insects, worms, or larvae:

• Sanskrit has aṇḍa (अण्ड) “egg; egg‑shaped; testicle; embryo”.
• Middle Indo‑Aryan (Prakrit) forms such as aṇḍū / aṇḍuya refer to small egg‑born creatures, especially maggots or worms.
• Several modern Indo‑Aryan languages preserve similar forms meaning “worm, grub, tiny insect”.

Thus, andū is best understood as a vernacular or regional Sanskritized form meaning:

“a small worm, grub, or insect (especially one emerging from eggs).”

✅ Devanagari spelling

Given the IAST form andū, the correct phonetic mapping is:

• a → अ
• n → न
• d → द
• ū → ऊ

So the Devanagari spelling is:

अन्दू

✅ Why not अंडू?

Although aṇḍa (अण्ड) contains retroflex ṇ and ḍ, the user’s form andū has n and d, not ṇ and ḍ.
Therefore the correct spelling follows the given transliteration: अन्दू, not अण्डू.

✅ Summary

• Meaning: a rare or dialectal Sanskrit/Prakrit‑derived word meaning “a small worm, grub, or insect.”
• Devanagari: अन्दू
• Attestation: not found in the major dictionaries listed in the supplied results; meaning inferred from linguistic parallels.