A gland is an organ in your body that produces and secretes substances like hormones or enzymes.
When we talk about glands, most people think of their endocrine system. That's the network of glands throughout our body that produce hormones to regulate things like growth, appetite, and even emotions. For example, you might have heard of the thyroid gland - it helps control metabolism. Or, you might know someone who takes medication for a hormonal imbalance related to their adrenal gland.
An organ that synthesizes a substance, such as hormones or breast milk, and releases it, often into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland).
A compressable cylindrical case and its contents around a shaft where it passes through a barrier, intended to prevent the passage of a fluid past the barrier, such as:
