(?), n. [NL., fr. Gr. la`mbda.] 1. The name of the Greek letter , , 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

Lambda moth (Zol.), a moth so called from a mark on its wings, resembling the Greek letter lambda ().
[1913 Webster]


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Tue 19th January 2021