वैयाकरण सिद्धान्त कौमुदी (भट्टोजि दीक्षित - बालमनोरमा व तत्त्वबोधिनी टीका सम्पूर्ण पूर्वार्ध)

/tu-kṣu). It is indeed टुक्षु!

Let's check line 6:
ऊर्णुञ् आच्छादने ॥ उदात्त उभयतोभाषः ॥ ३० द्यु अभिगमने । ३१ षु प्रसवैश्वर्ययोः ।
Wait, "३० द्यु अभिगमने":
Let's check Dhatupatha: root 30 of Adadi is "द्यु अभिगमने" (or "यु अभिगमने" already occurred at 23).
Yes, 23 is यु मिश्रणेऽमिश्रणे च, and 30 is द्यु अभिगमने. Line 7 says "द्युप्रभृतयोऽनुदात्ताः". So it is definitely "द्यु"!

Let's check line 15:
उदात्ता उदात्तेतः परस्मैभाषाः ॥ ५८ ञिष्वप् शये ॥ उदात्तः परस्मैभाषः॥ ५९ श्वस
Wait, look at "५८ ञिष्वप्":
Wait, is it ञिष्वप् or जिष्वप्?
Look at the character: it really is shaped like 'जि' or 'ञि'?
Wait, look at 'जि' in line 1: पिजि.
Look at 'जि' in line 2: पृजि, वृजि.
Look at 'जि' in line 15: "५८ जिष्वप्" - wait, in line