A Glomerulus

1. (anatomy) A small intertwined group of capillaries within nephrons of the kidney that filter the blood to make urine. Glomerulus (kidney) - Wikipedia
2. (anatomy) A structure in the olfactory bulb central to olfactory sensory transduction, composed of receptor neuron axons and mitral neuron dendrites and organized by odor type. Glomerulus (olfaction) - Wikipedia
3. Any of several other similar intertwined masses of things