விண்மீன்
The night sky, in the oldest Tamil imagination, was an ocean.
Not a metaphor. A structural understanding. The dark expanse above behaved like the dark expanse below — vast, full of moving creatures, navigable if you knew how to read it. When the Sangam poets looked up, they saw fish. They named accordingly: விண்மீன் (viṇmīn) — sky-fish.
The compound has been so thoroughly ordinary for so long that most Tamil speakers don’t see the fish anymore. They see a word for star. But the creature is still in there, swimming.
What happened next is the story of most Tamil words — a Sanskrit system arrived, more precise, more useful, and better connected to the bureaucratic and religious infrastructure of medieval South Asia. நட்சத்திரம் (naṭcattiram, from Sanskrit nakshatra) brought with it an entire celestial grid: lunar mansions, birth stars, the astrological architecture that Tamil culture absorbed completely and now considers native. The star became a position in a system.
The fish became literature.
Time runs left to right. Solid lines mark descent; dashed lines mark semantic borrowing.
Sources pending.