2017年6月英语四级词汇前缀：ob-(oc-,of-,op-,os-,o-)思维导图

前缀ob-来源于拉丁介副词ob，原意是“toward”，在构词当中又引申出“against,inversely”等意思，还有“to,intheway,over,away,completely,intensive”等含义。ob-是个原生词缀，一般与拉丁词根缀合，所构成的派生词的词性取决于词根或后缀的属性。由于语音的同化作用，ob-在c,f,p前面，变成oc-,of-,op-。在元音字母及其它辅音字母前，ob-形态不变。

ob-

prefixmeaning"toward,against,across,down,"alsousedasanintensive,fromLatinob"toward,to,overagainst,inthewayof,byreasonof,about,before,infrontof,"fromPIEroot*epi,also*opi"near,against"(seeepi-).

oc-

assimilatedformofob-before-c-.

of-

assimilatedformofob-before-f-.

op-

assimilatedformofob-before-p-.

os-

frequentformofob-before-c-and-t-inwordsfromLatin.

oppress,opprobrium

obnoxious,opportune

officious,obsequious,obsession

obscene,obfuscate,obscure

obviate,omission

obese,obdurate,obeisance

occult,occupied