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The ear drum, or middle ear. Sometimes applied incorrectly to the tympanic membrane. See Ear.

he cylindrical part of a boiler, containing the flues. -- Barrel of the ear (Anat.), the tympanum, or tympanic cavity. -- Barrel organ, an instrument for producing music by the action of a revolving cylinder. -- Barrel vault. See under Vault.

The state of being braced or tight; tension. The laxness of the tympanum, when it has lost its brace or tension. Holder.

The tympanum. See Illust. of Ear.

he middle ear through the nose or mouth. -- Eustrachian tube (Anat.), a passage from the tympanum of the ear to the pharynx. See Ear. -- Eustachian valve (Anat.), a crescent-shaped fold of the lining membrane of the heart at the entrance of the vena cava inferior. It directs the blood towards the left auricle in the…

A small opening; esp., one of the apertures, closed by membranes, between the tympanum and internal ear.

One of the small bones in the tympanum of the ear; the anvil bone. See Ear.

When we have occasion to listen, and give a more particular attention to same sound, the tympanum is drawn to a more than ordinary tension. Holder.

A little bone; as, the auditory ossicles in the tympanum of the ear.

Insect. -- Persian red. See Indian red (a), under Indian. -- Persian wheel, a noria; a tympanum. See Noria.

Situated behind the tympanum, or in the skull, behind the auditory meatus.

A prominence on the inner wall of the tympanum of the ear.

eel, a wheel for raising water, having scoops or buckets attached to its circumference; a tympanum.

A panel; a tympanum.

Like a tympanum or drum; acting like a drumhead; as, a tympanic membrane.

A combining form used in anatomy to indicate connection with, or relation to, the tympanum; as in tympanohyal, tympano-Eustachian.

Of or pertaining to the tympanum and the hyoidean arch. -- n.