uppermost and largest part of the hip bone, and appears in most vertebrates (including mammals and birds), but not bony fish or snakes
via Wikipedia infobox
The ilium (/ˈɪliəm/) (pl.: ilia) is the uppermost and largest region of the coxal bone, and appears in most vertebrates including mammals and birds, but not bony fish. All reptiles have an ilium except snakes, with the exception of some snake species which have a tiny bone considered to be an ilium.
The ilium of the human is divisible into two parts, the body and the wing; the separation is indicated on the top surface by a curved line, the arcuate line, and on the external surface by the margin of the acetabulum.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).