Lambda \Lamb"da\, n. [NL., fr. Gr. ?.]

1. The name of the Greek letter [Lambda], [lambda], corresponding with the English letter L, l.

2. (Anat.) The point of junction of the sagittal and lambdoid sutures of the skull.

Lambda moth (Zo["o]l.), a moth so called from a mark on its wings, resembling the Greek letter lambda ([Lambda]).

Source: Webster's Revised Unabridged Dictionary (1913)