Anatolian languages
W. M. Austin (1942) concluded that there was early contact between Armenian and Anatolian languages, based on what he considered common archaisms, such as the lack of a feminine gender and the absence of inherited long vowels. However, unlike shared innovations (or "synapomorphies"), the common retention of archaisms (or "symplesiomorphy") is not considered conclusive evidence of a period of common isolated development. There are words used in Armenian that are generally believed to have been borrowed from Anatolian languages, particularly from Luwian, although some researchers have identified possible Hittite loanwords as well. One notable loanword from Anatolian is Armenian "xalam", "skull", cognate to Hittite "ḫalanta", "head".