7 U.S.C. § 8201

In this chapter:
(1) Eligible orchardist
The term “eligible orchardist” means a person that produces annual crops from trees for commercial purposes.
(2) Natural disaster
The term “natural disaster” means plant disease, insect infestation, drought, fire, freeze, flood, earthquake, lightning, and other occurrence, as determined by the Secretary.
(3) Secretary
The term “Secretary” means the Secretary of Agriculture.
(4) Tree
The term “tree” includes a tree, bush, and vine.

Official source