GNU Collaborative International Dictionary of English

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1.       
   ‖Lambda , n. [NL., fr. Gr. λάμβδα.]
   The name of the Greek letter Λ, λ, corresponding with the English letter L, l.
   1913 Webster
   (Anat.) The point of junction of the sagittal and lambdoid sutures of the skull.
   1913 Webster
   (Phys.) A subatomic particle carrying no charge, having a mass equal to 2183 times that of an electron; it decays rapidly, typically forming a nucleon and a pion. MW10
   PJC
   Lambda moth (Zool.), a moth so called from a mark on its wings, resembling the Greek letter lambda (Λ).
   1913 Webster