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state of being dilated; expansion; dilatation. Mrs. Browning. At first her eye with slow dilation rolled. Tennyson. A gigantic dilation of the hateful figure. Dickens.

bag shaped like a leathern bottle, as the dilated end of a vessel or duct; especially the dilations of the semicircular canals of the ear.

A soft, pulsating, hollow tumor, containing blood, arising from the preternatural dilation or rupture of the coats of an artery. [Written also aneurysm.]

The act or process of augmenting, or making larger, by addition, expansion, or dilation; increase.

bone. -- Cheek by jowl, side by side; very intimate. -- Cheek pouch (Zoöl.), a sacklike dilation of the cheeks of certain monkeys and rodents, used for holding food. -- Cheeks of a block, the two sides of the shell of a tackle block. -- Cheeks of a mast, the projection on each side of a mast, upon which the trestle…

A dilation or enlargement of a canal or other organ.

Causing dilation; tending to dilate, on enlarge; expansive. Coleridge.

lian tree (Duboisia myoporoides), and regarded as identical with hyoscyamine. It produces dilation of the pupil of the eye.

The act of expanding or spreading out; the condition of being expanded; dilation; enlargement.

Livid and painful swellings formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus is occasionally discharged; piles; emerods. [The sing. hemorrhoid is rarely used.]

Causing dilation or relaxation of the blood vessels; as, the vasodilator nerves, stimulation of which causes dilation of the blood vessels to which they go. These nerves are also called vaso- inhibitory, and vasohypotonic nerves, since their stimulation causes relaxation and rest.

hich afferent impulses are changed into efferent, -- vasomotor impulses leading either to dilation or constriction of the blood vessels.

To have the constituent particles move to and fro, with alternate compression and dilation of parts, as the air, or any elastic body; to quiver.