1.odor n．氣味(smell)

詞根記憶：od(聞)+or--氣味

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

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

詞根記憶：來自offend(v.冒犯：違反)

例：habitual offender慣犯

同根詞：offensive(a．攻擊的；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.抵銷(to countervail)；補償(to compensate for)

來自詞組：set off(抵銷)

注意：onset(n.襲擊：突然開始)

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.（動物的）崽；后代(descendant)

聯想記憶：off(出來)+spring(春天)--春天出來的--（動物的）崽

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

7.olfactory a．嗅覺的(of, relating to, or contributing to the sense of smell)

詞根記憶：ol(=smell味)+fact(做)+ory--做出味道來--聞到--嗅覺的

例：The poisonous gas damaged my olfactory nerves.

8.omen n．征兆，預兆(a phenomenon supposed to portend good or evil ;a prophetic sign)

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

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

詞根記憶：omi(t)(省略，遺漏)+ssion--遺漏

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