1. a private form of speech invented by one child or by children who are in close contact, as twins.
2. a pathological condition characterized by speech so distorted as to be unintelligible.
1. a condition in which words are so poorly articulated that speech is either unintelligible or appears to be a made-up language.
Rachel, the babysitter, tried her absolute best to get Holly and Hazel to get ready for bed but ultimately gave up when the twins' combined idioglossia prevented any sort of successful communication.
Sorry for severely encroaching on Wednesday's time; I'm still awake from Tuesday's time, so I'm using it to post my word. Sorry again!