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：dorso-, dors-, dorsi-, -dorsal

【来源及含义】Latin: back, on the back, pertaining to the back, near the back

【相关词根词缀】 Word families with similar applications: "back, backside" word units: lumbo- (loin, lower back); nuch- (nape of the neck); pygo- (rump, rear end, back side).

【同源单词】antedorsal, centrodorsal, dorsa, dorsad, dorsal, dorsalis