adminiculum
/ˌæd.min.ɪkʊˈlʌm/Definitions
1. noun
A small or secondary part of a larger structure, especially a bone or a limb.
“The veterinarian examined the cat’s adminiculum to determine the extent of the fracture.”
2. noun
A supporting or auxiliary part of something.
“The adminiculum of the bridge played a crucial role in its stability.”