Correct spelling for the English word "hlllock" is [ˌe͡ɪt͡ʃˈɛllˈɒk], [ˌeɪtʃˈɛllˈɒk], [ˌeɪ_tʃ_ˈɛ_l_l_ˈɒ_k] (IPA phonetic alphabet).
In anatomy, any small elevation or prominence.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.