Added 10 October 2026 siamese noun Categories: LanguagePeopleRare Words noun ! Definition from WordNet 3.1, Princeton University. More about siamese at Wordnik → Where our words come from → A branch of the Tai languages. A native or inhabitant of Thailand. An inlet with two or more couplings to which a hose can be attached so that fire engines can pump water into the sprinkler system of a building. adjective Of or relating to or characteristic of Thailand or its people. Siamese kings Of or relating to the languages of the Thai people. Thai tones Of or relating to Thailand. the Thai border with Laos Related Words: thaiconnectedsimilartwintaisyamesethailandishsamic Back to today's word