\Pey"er's glands`\ [So called from J. K. Peyer,
who described them in 1677.] (Anat.)
Patches of lymphoid nodules, in the walls of the small
intestiness; agminated glands; -- called also {Peyer's
patches}. In typhoid fever they become the seat of ulcers
which are regarded as the characteristic organic lesion of
that disease.