Very Thin, or to Do With the Body’s Bones
Puzzle 3 of Alliteration Piece of Cake Pack
Question is: Very Thin, or to Do With the Body’s Bones
and the answer is: SKELETAL
Word Meaning:
SKELETAL — (paleontology, informal) Shorthand for skeletal diagram (a black-and-white drawing of a [usually extinct] animal’s skeleton to be used as a reference for paleoart)
Definitions from Wiktionary.