prelingual non-syndromic genetic hearing loss https://github.com/monarch-initiative/mondo/issues/551 MEDGEN:1647959 prelingual non-syndromic genetic deafness SCTID:764098007 GARD:0025069 UMLS:C4706679 Orphanet:216445 A rare, genetically highly heterogeneous otorhinolaryngologic disease, resulting from inner and/or middle ear or hearing nerve anomalies, typically characterized by bilateral, severe to profound hearing loss (mean sensorineural hearing impairment of 60 dB or more for 500-, 1,000-, and 2,000-Hz frequency tones in the better ear) which occurs before the onset of speech development and is not associated with visible external ear abnormalities or any other medical problems. It is usually nonprogressive and impedes oral language acquisition. MONDO:0016297 isolated prelingual genetic deafness prelingual non-syndromic genetic hearing loss postlingual non-syndromic genetic hearing loss nonsyndromic genetic hearing loss