Meanings
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1
adj
historical: relating to Siam, the former name of Thailand, or to its people, culture, or language
The nineteenth-century account compared Siamese and neighboring communities.
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2
noun
a Siamese cat, a slender short-haired breed with blue eyes and darker coloring on the face, ears, feet, and tail
The Siamese followed its owner from room to room and meowed loudly.
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3
adj
joined, paired, or arranged with two branches feeding one connection, as in a Siamese hose connection
Firefighters attached two hoses to the building's Siamese connection.
Thesaurus
Etymology
From Siam, the former English name of Thailand, + -ese. The cat and fighting-fish names reflect breeds associated with Siam. The sense "joined or paired" arose from the older expression Siamese twins, after Chang and Eng Bunker, conjoined twins born in Siam in 1811.