## quadrilateral

{adj: quadrilateral, four-sided} having four sides

{adj: tetragonal} of or relating to or shaped like a quadrilateral

{n: Corvus, Crow} a small quadrilateral constellation in the southern hemisphere near Virgo

{n: equal-area projection, equal-area map projection} a map projection in which quadrilaterals formed by meridians and parallels have an area on the map proportional to their area on the globe

{n: gaffsail, gaff-headed sail} a quadrilateral fore-and-aft sail suspended from a gaff

{n: gaff} a spar rising aft from a mast to support the head of a quadrilateral fore-and-aft sail

{n: parallelogram} a quadrilateral whose opposite sides are both parallel and equal in length

<-> trapezium

{n: quadrilateral, quadrangle, tetragon} a four-sided polygon

{n: serratus posterior inferior} a thin quadrilateral muscle at the junction of the thoracic and lumbar regions; acts to counteract the pull of the diaphragm on the ribs to which it is attached

{n: serratus posterior superior} a thin quadrilateral muscle of the upper and dorsal part of the thorax; acts to elevate the upper ribs

{n: shear} (physics) a deformation of an object in which parallel planes remain parallel but are shifted in a direction parallel to themselves

"the shear changed the quadrilateral into a parallelogram"

{n: trapezium} a quadrilateral with no parallel sides

<-> parallelogram

{n: trapezoid} a quadrilateral with two parallel sides

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