inspiration - arousal of the mind to special unusual activity or creativity

taproot - something that provides an important central source for growth or development; "the taproot of his resentment"; "genius and insanity spring from the same taproot"

muse - the source of an artist's inspiration; "Euterpe was his muse"

anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical structure; "he has good bone structure"

microorganism - any organism of microscopic size