noun: (biochemistry) Abbreviation of transthyretin. [(biochemistry) a protein found in human blood serum and cerebrospinal fluid that functions as a carrier of the thyroid hormone thyroxine and the retinol-binding protein]
noun: (linguistics) Abbreviation of type-token ratio. [(corpus linguistics) The ratio of how many different words (types) occur in a text or corpus to the overall number of words (tokens) in the same text or corpus.]
