Noun
The state of being cut off.
A figure of speech employed when a speaker having begun to say a thing stops abruptly: thus, "He is a man of so much honor and candor, and of such generosity -- but I need say no more."
Source: Webster's dictionaryThe antlers in the photo you submitted appear to have an abscission line from where the antler formerly attached to the pedicle. Source: Internet
“Not only does the leaf color go directly from green to brown, the leaves stay attached because abscission tissue hadn’t sufficiently developed.” Source: Internet
Summertime leaf drop during an extreme drought such as this is a good thing because it shows branches are still alive and capable of forming the abscission layer that permits the leaf to drop. Source: Internet