Prelingual

Prelingual: Before the development of speech and language. 'She showed that in prelingually deaf people (that is, those who had been born deaf or become deaf before the age of two or so), the auditory parts of the brain had not degenerated or atrophied.' (From The Mind's Eye, by Oliver Sacks, The New Yorker, July 28, 2003). See also: Lingual.
Found on http://www.medterms.com/script/main/art.asp?articlekey=23951

prelingual

prelingual Occurring before the development of language.
Found on http://www.wordinfo.info/words/index/info/view_unit/1193/5
No exact match found