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plural mallei
(anatomy) The small hammer-shaped bone of the middle ear. quotations examples
The tympanic cavity is spanned by the three smallest bones in the body: the auditory ossicles […] These bones, named for their shape, are the malleus (malʹe-us; "hammer"); the incus (ingʹkus; "anvil"); and the stapes (staʹpēz; "stirrup"). The "handle" of the malleus is secured to the eardrum, and the base of the stapes fits into the oval window.
2010, Elaine N. Marieb, Katja Hoehn, Human Anatomy & Physiology, 8th edition, page 576
(ichthyology) The tripus (ossicle in cypriniform fishes).
(zoology) One of the paired calcareous structures within the mastax of rotifers. quotations
[…] in the typical mastax of a Brachionus there are two hammer-like bodies (mallei), which work on a kind of split anvil (incus); […] each malleus consists of an upper part or head (uncus) and a lower or handle (manubrium);
1884, “Memoirs: An Attempt to re-classify the Rotifers”, in Quarterly Journal of Microscopical Science 1884 s2-24, C.T.: Hudson, pages 335-356