词根词缀：centro-, centr-, centri-, kentro-

【来源及含义】Greek > Latin: center; middle point, mid point; focus, focal point, focalize; zero in on

【相关描述】This element originally meant "sharp point, goad" or "spur".

【同源单词】acentric, acentric, acrocentric, allocentric, ambulatory surgery center, amphicentric

词根词缀：mater-, matri-, matro- matr-

【来源及含义】Latin: mother, mama, mom; mum [British]

【同源单词】alma mater, dura mater, mater, materfamilias, maternal aunt, maternal dystocia