The phrase "inner disk" refers to the central or middle part of something that is circular or disk-shaped. It is the area closer to the center and away from the outer edges. Full definition
An interpretation of an inclined inner disk combined with a dust halo is compatible with both our and previous observations, but other arrangements of the dust can not be ruled out. (arxiv.org)
Only galaxies with large - scale bars appear to have these grand - design inner disks — a spiral within a spiral. (cafepress.com)
Hansen Type II intervertebral disk disease involves a slower, more gradual degenerative process that leads to chronic bulging of inner disk material into the spinal canal, with subsequent pressure on and compression of the spinal cord. (petwave.com)