Crinos is one of the stages of transformation a werecreature can take. Crinos is halfway between fully human and fully animal, and is generally significantly larger, better higher dexterity and stanima, stronger, and more powerful than the humanoid form. There are disadvantages as well. Once in crinos form the individual is unable to speak.
Wererats and Wereweasels are notable exceptions, and their Crinos forms are slightly smaller than their humanoid form.