1. Plural of fibrilla; small fibers or fibril-like structures, especially in anatomy and biology.
Usage: technical; anatomy; biology; Latin plural form

Examples

• The muscle fibrillae contract in response to neural signals.
• Under the microscope, the fibrillae of the connective tissue were clearly visible.
• Cardiac fibrillae are responsible for the coordinated beating of the heart.
• The plant's root fibrillae absorb water and nutrients from the soil.
• Collagen fibrillae provide structural support to the skin.