Definition of "lambdoidal"

Examination of characteristics said to be unique for Neandertals (22 ) indicates that Mlade 6 has a suprainiac fossa of elliptical form, extensive lambdoidal flattening, and a short posterior face on the occiput.

2001 January 12, Milford H. Wolpoff et al., “Modern Human Ancestry at the Peripheries: A Test of the Replacement Theory”, in Science‎, volume 291, number 5502, pages 293–297