1.odor n．气味(smell)

词根记忆：od(闻)+or--气味

例：The odor of freshly baked apple pie came from the kitchen.

2.offender n．冒犯者；违法者(one that transgresses the moral or divine law)

词根记忆：来自offend(v.冒犯：违反)

例：habitual offender惯犯

同根词：offensive(a．攻击的；冒犯的)

3.off-season n．淡季(slack);a．淡季的（being in a period of slack）

例：The football players became more aggressive during the season and remained so during the off-season.

4.offsot v.抵销(to countervail)；补偿(to compensate for)

来自词组：set off(抵销)

注意：onset(n.袭击：突然开始)

例：Great risks must be offset by the chance of great rewards.//Henry has to offset his small salary by living economically.

5.offshoot n．分支(a branch, descendant, or member)

例： They originated as offshoots of church-related groups.

6.offspring n.（动物的）崽；后代(descendant)

联想记忆：off(出来)+spring(春天)--春天出来的--（动物的）崽

例：Monogamous parents should cooperate to care for their offspring.

7.olfactory a．嗅觉的(of, relating to, or contributing to the sense of smell)

词根记忆：ol(=smell味)+fact(做)+ory--做出味道来--闻到--嗅觉的

例：The poisonous gas damaged my olfactory nerves.

8.omen n．征兆，预兆(a phenomenon supposed to portend good or evil ;a prophetic sign)

例：Black rain clouds are an omen of heavy rainstorms.

9.omission n.遗漏(something neglected or left undone)

词根记忆：omi(t)(省略，遗漏)+ssion--遗漏

例：The omission of your article from the journal was accidental.