cryptophasia

== English == === Etymology === From Ancient Greek κρυπτός (kruptós, “hidden”) + -φασία (-phasía, “speech”) (from φάσις (phásis, “utterance”), from φημί (phēmí, “I speak”)). Equivalent to crypto- +‎ -phasia. === Noun === cryptophasia (uncountable) The development by twins (identical or fraternal) of a language that only they can understand. ==== Related terms ==== cryptolect === See also === idioglossia