An antique churn for making butter. The definition of a churn is a device for making butter. An example of a churn is what the Amish use to make butter. To churn is defined as to stir or shake milk or cream with intense movements in the process of making butter, to stir up and agitate, or to produce something at a rapid and regular rate.
Spiders and scorpions are members of one chelicerate group, the arachnids. Scorpions' chelicerae have three sections and are used in feeding. Spiders' chelicerae have two sections and terminate in fangs that are generally venomous, and fold away behind the upper sections while not in use.
The 35,000 known types of spiders are grouped into 70 different families. Some examples are tarantulas, which belong to the spider family Theraphosidae, and wolf spiders, which belong to the family Lycosidae.