What is a prefix for voluminous?

There isn't a single perfect prefix that captures the essence of "voluminous" in a way that's universally understood. However, depending on the specific nuance you want to convey, some options could be:

Emphasizing size:

* Mega-: This prefix implies extreme size, as in "megavoluminous."

* Macro-: Similar to "mega," emphasizing large scale, as in "macrovoluminous."

* Hyper-: Suggests an extreme or excessive amount, as in "hypervoluminous."

* Super-: Similar to "hyper," implying something exceeding the usual size, as in "supervoluminous."

Emphasizing quantity:

* Multi-: Suggests multiple parts or elements, as in "multivoluminous."

* Poly-: Similar to "multi," emphasizing many parts, as in "polyvoluminous."

* Abundant-: Clearly emphasizes a large amount, as in "abundant voluminous."

Emphasizing fullness:

* Full-: Directly conveys fullness, as in "full voluminous."

* Over-: Suggests exceeding capacity, as in "overvoluminous."

The best prefix will depend on the context and the specific meaning you want to convey.