1. Of or relating to Siam; Thai.

2. siamese Of or being a Y-shaped dual connection between two pipes or hoses and a larger pipe or hose.

1. A native or inhabitant of Siam; a Thai.

2. The Thai language.

3. A domestic cat of a long slender breed originating in Siam, having blue eyes and a short whitish to fawn coat with darker ears, face, tail, and feet.