D defs.my
Entry 1 sense Webster, 1913

Diencephalon

· Di·en·ceph·a·lon · IPA /ˌdaɪ̯.ənˈsɛfəlɑn/
01 n. The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon.
  1. 1.
    The interbrain or thalamencephalon; -- sometimes abbreviated to dien. See Thalamencephalon.(Anat.) See: Thalamencephalon