Definition of "incus" [‖In•cus]

• An anvil-shaped bone between the malleus and the stapes in the mammalian middle ear. Also called anvil. (noun)
• A thunderhead. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Connected with the malleus is another small bone, called the incus, or anvil, which is connected with another, called the stapes, or stirrup, from its shape."
• "The malleus is connected through a tiny joint to the incus, which is attached to the stapes, both of which vibrate in their turn as result of the vibrations of the bone preceding them."
• ""The malleus and the incus are the remnants of bones that in our reptilian ancestors were to be found in the jaw, as I explained earlier."