Definition of fulcrum

• n. - A prop or support.
• n. - That by which a lever is sustained, or about which it turns in lifting or moving a body.
• n. - An accessory organ such as a tendril, stipule, spine, and the like.
• n. - The horny inferior surface of the lingua of certain insects.
• n. - One of the small, spiniform scales found on the front edge of the dorsal and caudal fins of many ganoid fishes.
• n. - The connective tissue supporting the framework of the retina of the eye.