Definition: The word "aciculae" in English is a Latin word which translates as "foot or toe". It is used to describe the bone that connects the hip joint, where the knee and ankle are connected. The term "axilus" has a similar meaning but it refers to the middle joint of a leg. The term "axila" is also related to the axilla, which is an area on the shoulder blade. In this context, "aciculae" is often used in conjunction with these terms to refer to any bone that connects or supports the hip joint. The word "acicula" can also be used as a prefix meaning "head", and it appears in Latin texts before the 2nd century BC. However, its modern usage as a noun has been replaced by "axilla".