From OMIM
Branchiootorenal syndrome is an autosomal dominant disorder characterized by sensorineural, conductive, or mixed hearing loss, structural defects of the outer, middle, and inner ear, branchial fistulas or cysts, and renal abnormalities ranging from mild hypoplasia to complete absence. Reduced penetrance and variable expressivity has been observed (Fraser et al., 1978). Genetic Heterogeneity of Branchiootorenal Syndrome See also BOR2 (610896), caused by mutation in the SIX5 gene (600963) on chromosome 19q13. Sanchez-Valle et al. (2010) stated that approximately 40% of patients with BOR have mutations in the EYA1 gene and 5% have mutations in the SIX5 gene. See also branchiootic (BO) syndrome-1 (BOS1; 602588) and the otofaciocervical syndrome (OFC; 166780), allelic disorders showing overlapping phenotypes but without renal anomalies. See also 600257 for a discussion of the BOR-Duane-hydrocephalus contiguous gene syndrome as described by Vincent et al. (1994). Although Melnick et al. (1978) maintained that the BOR syndrome is distinct from the BO syndrome because in the latter condition renal anomaly is absent and deafness is not a constant feature, Cremers and Fikkers-van Noord (1980) concluded that the 2 syndromes are in fact a single entity.  http://www.omim.org/entry/113650

From MedlinePlus Genetics
"Renal" refers to the kidneys; BOR syndrome (but not BO syndrome) causes abnormalities of kidney structure and function. These abnormalities range from mild to severe and can affect one or both kidneys. In some cases, end-stage renal disease (ESRD) develops later in life. This serious condition occurs when the kidneys become unable to filter fluids and waste products from the body effectively.

"Oto-" and "-otic" refer to the ear; most people with BOR/BO syndrome have hearing loss and other ear abnormalities. The hearing loss can be sensorineural, meaning it is caused by abnormalities in the inner ear; conductive, meaning it results from changes in the small bones in the middle ear; or mixed, meaning it is caused by a combination of inner ear and middle ear abnormalities. Some affected people have tiny holes in the skin or extra bits of tissue just in front of the ear. These are called preauricular pits and preauricular tags, respectively.

"Branchio-" refers to the second branchial arch, which is a structure in the developing embryo that gives rise to tissues in the front and side of the neck. In people with BOR/BO syndrome, abnormal development of the second branchial arch can result in the formation of masses in the neck called branchial cleft cysts. Some affected people have abnormal holes or pits called fistulae in the side of the neck just above the collarbone. Fistulae can form tunnels into the neck, exiting in the mouth near the tonsil. Branchial cleft cysts and fistulae can cause health problems if they become infected, so they are often removed surgically.

Branchiootorenal (BOR) syndrome is a condition that disrupts the development of tissues in the neck and causes malformations of the ears and kidneys. The signs and symptoms of this condition vary widely, even among members of the same family. Branchiootic (BO) syndrome includes many of the same features as BOR syndrome, but affected individuals do not have kidney abnormalities. The two conditions are otherwise so similar that researchers often consider them together (BOR/BO syndrome or branchiootorenal spectrum disorders).  https://medlineplus.gov/genetics/condition/branchiootorenal-branchiootic-syndrome