A quartic surface whose graphical representation looks like an indented bar stool cushion. The equation for the surface is as follows:

z2x2 - z4 - 2zx2 + 2z3 + x2 - z2 - (x2 - z)2 - y4 - 2x2y2 - y2z2 + 2y2z + y2 = 0

Cush"ion (k??sh"?n), n. [OE. cuischun, quisshen, OF. coissin, cuissin, F. coussin, fr. (assumed) LL. culcitinum, dim. of L. culcita cushion, mattress, pillow. See Quilt, and cf. Counterpoint a coverlet.]


A case or bag stuffed with some soft and elastic material, and used to sit or recline upon; a soft pillow or pad.

Two cushions stuffed with straw, the seat to raise. Dryden.


Anything resembling a cushion in properties or use

; as: (a)

a pad on which gilders cut gold leaf

; (b)

a mass of steam in the end of the cylinder of a steam engine to receive the impact of the piston

; (c)

the elastic edge of a billiard table.


A riotous kind of dance, formerly common at weddings; -- called also cushion dance.


Cushion capital.Arch. A capital so sculptured as to appear like a cushion pressed down by the weight of its entablature. (b) A name given to a form of capital, much used in the Romanesque style, modeled like a bowl, the upper part of which is cut away on four sides, leaving vertical faces. -- Cushion star Zool. a pentagonal starfish belonging to Goniaster, Astrogonium, and other allied genera; -- so called from its form.


© Webster 1913.

Cush"ion (k??sh"?n), v. t. [imp. & p.p. Cushioned (-?nd); p. pr. & vb. Cushioning.]


To seat or place on, or as on a cushion.

Many who are cushioned on thrones would have remained in obscurity. Bolingbroke.


To furnish with cushions; as, to cushion a chaise.


To conceal or cover up, as under a cushion.

Cushioned hammer, a dead-stroke hammer. See under Dead-stroke.


© Webster 1913.

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