Definition of "sedge"

Any plant of the genus Carex, the true sedge, perennial, endogenous herbs, often growing in dense tufts in marshy places. They have triangular jointless stems, a spiked inflorescence, and long grasslike leaves which are usually rough on the margins and midrib. There are several hundred species.  quotations  examples

Any plant of the family Cyperaceae.  examples

Any of certain other plants resembling sedges, such as Gentiana rubricaulis and Andropogon virginicus.  examples

(fishing) A dry fly used in fly fishing, designed to resemble a sedge or caddis fly.  examples

Obsolete spelling of siege  examples

A flock of herons, cranes, or bitterns.  examples