A<unk>  (formerly called a<unk>  is a depression or pit at the part of an organ where structures such as blood vessels and nerves enter.
Medial depression for blood vessels and ureter to enter kidney chamber
The adjective form is "hilar", and the plural is "hila".
Hilum
Interspinous plane
Intertubercular plane
Subcostal plane
Costomediastinal recess
Bone island
Osler nodes
Operon