1. 脱落：abscisic acid脱落酸 | abscission脱落 | absolute绝对的
2. 切断：abscissa 横坐标 | abscission 切断 | abscond 潜逃
3. 切断, 除去：allusion 提及, 暗示 | abscission 切断, 除去 | rescission 废除
4. 切除：abscission 截断 | abscission 切除 | absence of mind 心不在焉
noun
1. the act of cutting something off
Synonym: cutting off
2. shedding of flowers and leaves and fruit following formation of scar tissue in a plant