Dictionary:

limbic

  (lĭm'bĭk)

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1. Of, relating to, or characterized by a limbus.
2. Of or relating to the limbic system.

[French limbique, from limbe, edge, from Old French, graduated edge of an astronomical instrument. See limb².]

1. Of, relating to, or characterized by a limbus.
2. Of or relating to the limbic system.

Pertaining to a limbus, or margin.

• l. conjunctiva — the mucous membrane at the place of transition from corneal to conjunctival epithelium.
• l. system — a system of brain structures common to the brains of all mammals, comprising the phylogenetically old cortex (archipallium and paleopallium) and its primarily related nuclei. It is associated with olfaction, autonomic functions and certain aspects of emotion and behavior.

The adjective has one meaning:

Meaning #1: of or relating to or forming a limbus
  Pertains to noun: limbus (meaning #1)