Siamese twins (linguistics) also known as a trinomial. Another name for this collocation is tricolon when the three parts are of the same or consistent grammatical form. Many of these could be considered triplets and satisfy the rule of three in writing. Siamese twins (linguistics) Siamese twins (also irreversible binomials, binomials, binomial pairs, nonreversible word pairs, or freezes) in the context of the English language refer to a pair or group of words used together as an idiomatic expression or collocation, usually conjoined by the words "and" or "or". The order of elements cannot be reversed. The expressions "milk and honey" (two nouns),
Tarzan and the Tarzan Twins it features Tarzan's first meeting with Doctor Karl von Harben, with whom he is already acquainted in "Empire". Because "Twins" is a children's book, however, it is customarily omitted from listings of the main Tarzan series. Thus "Tarzan, Lord of the Jungle" is generally considered the eleventh Tarzan book rather than "Twins". Two schoolboys, Dick and Doc, are cousins who resemble each other because their mothers are twins. As Dick is also related to Tarzan through his father, they become known as the Tarzan Twins. Invited to visit Tarzan's African estate, they become lost in the jungle and are imprisoned