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The Collaborative International Dictionary of English v.0.48 (gcide)

Lambda \Lamb"da\, n. [NL., fr. Gr. la`mbda.]
1. The name of the Greek letter [Lambda], [lambda],
corresponding with the English letter L, l.
[1913 Webster]

2. (Anat.) The point of junction of the sagittal and lambdoid
sutures of the skull.
[1913 Webster]

3. (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 ([Lambda]).
[1913 Webster]