Final answer:
Polymorphism for binary search trees refers to the trees' capability to manage different data types and perform various operations using different algorithms or methods.
Step-by-step explanation:
Being polymorphic for binary search trees means that the data structure can handle multiple forms of data or operate using different types of operations. This typically relates to the concept of polymorphism in object-oriented programming, where an interface is defined, and multiple classes can implement that interface in different ways. In the context of binary search trees, it might mean that the tree can sort and store different types of data (such as integers, strings, and so on) or that it can implement various operations (like insertion, deletion, and searching) using different algorithms or techniques depending on certain conditions.