The Collaborative International Dictionary of English v.0.48:

Lr \Lr\ n.
   The chemical symbol for lawrencium, a transuranic element
   of atomic number 103.

   Syn: lawrencium.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Lr
    n 1: a radioactive transuranic element synthesized from
         californium [syn: lawrencium, Lr, atomic number 103]

The Free On-line Dictionary of Computing (19 January 2023):

lr

    The country code for Liberia.

   (1999-01-27)