Gemelo/a (Identical twin)
Mellizo/a (fraternal twin)
The Swedish word for twin is tvilling.
The Maori word for twin is "tōmairangi."
Gemelo.
Doble
gemela
doble veinte
tengo un gemelo
twin is a real word, neither less nor more.
No, "twin" is not a long vowel word. It has a short vowel sound.
The word twin stands for the twin cities of Minneapolis-St. Paul. That is why the logo of the Twins is the T over the C.
You say, "gemelos."
a male twin = te'um (תאום) a female twin = te'umah (תאומה)