IPA: /ˈfɛl.ə.bəl/
KK: /ˈfɛləbəl/
Suitable or able to be cut down, especially referring to trees.
The forest is filled with fellable trees that can be harvested for timber.
Fellable → It is formed from "fell" (from Old English *fellan*, meaning to cause to fall) and "-able" (meaning capable of). The word "fellable" means capable of being caused to fall or able to be felled.
Think of something that can be made to 'fall' ('fell') and that it is 'capable of' ('-able') being done. This helps you remember that 'fellable' refers to something that can be caused to fall.