the eleventh letter of the Greek alphabet (Λ, λ), transliterated as ‘l.’.
) [followed by Latin genitive] Astronomy the eleventh star in a constellation:Lambda Tauri
Biology a type of bacteriophage virus used in genetic research: [as modifier]:lambda phage Anatomy the point at the back of the skull where the parietal bones and the occipital bone meet. [as modifier] Biochemistry denoting one of the two types of light polypeptide chain present in all immunoglobulin molecules (the other being kappa).
(λ) Astronomy celestial longitude.