The Grumpy Vegan has a glossary. All sorts of vegan-related and animal rights-related terms are defined and discussed.
It’s not a complete list, but it’s a good starting point.
Here are some example terms and definitions:
Anyone — human or animal
Class B Dealer
A Class B Dealer is licensed under the Animal Welfare Act for the purpose of acquiring animals for sale to laboratories for experimentation. U.S. Department of Agriculture regulations require that a Class B dealer may only obtain animals from “random sources” such as auction sales, other USDA–licensed dealers, pounds and shelters (where state law allows), “humane groups and contract pounds organized as legal entities under the laws of their State,” and from private persons who have raised and bred the animal on their own premises (which could include animals offered in “free to good home” ads).
The practice, used in the poultry industry for layer and meat bird operations, of cutting off part of the beaks of birds to prevent them from injuring other birds confined in tight quarters.
The egg industry’s practice of starving laying hens in order to stimulate egg production. During a natural molt (replacement of old feathers with new ones), a hen stops laying eggs to concentrate her energies on growing new feathers. Starving layer hens (typically between 5 and 14 days), which artificially triggers a forced molt, enables the egg industry to control the hens’ output.
Sow Gestation Crate
A metal-barred pen (2 feet by 7 feet) in which pregnant pigs are confined until they give birth. On a typical factory farm, breeding sows spend the majority of their reproductive lives confined in these crates.
The official definition for vegan – as per the British Vegan Society – is “ways of living that seek to exclude, as far as is possible and practical, all forms of exploitation of animals for food, clothing or any other purpose.”