The Collaborative International Dictionary
Lambdoid
Lambdoid \Lamb"doid\, a. [Gr. ?, la`mbda the letter lambda ([Lambda]) + e"i^dos shape.] Shaped like the Greek letter lambda ([Lambda]); as, the lambdoid suture between the occipital and parietal bones of the skull.
Wiktionary
lambdoid
a. Shaped like the Greek letter lambda: image:Greek_uc_lamda.png
Wikipedia
Usage examples of "lambdoid".
The scars could be made out, but there was nothing of that yielding either side of the sagittal suture and a little above the lambdoid that had worried Dr Maturin.
Donne describes an athletic laborer of twenty-five who received a wound from a rifle-ball penetrating the cranial parietes immediately in the posterior superior angle of the parietal bone, and a few lines from the lambdoid suture.