chaff

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To make fun of in a good-natured way; tease.
• intransitive verb To engage in playful teasing.
• noun Good-natured teasing; banter.
• noun Botany Thin dry bracts or scales, especially.
• noun The dry bracts enclosing mature grains of wheat and some other cereal grasses, removed during threshing.
• noun The scales or bracts borne on the receptacle among the small individual flowers of many plants in the composite family.
• noun Finely cut straw or hay used as fodder.
• noun Trivial or worthless matter.
• noun Strips of metal, foil, or glass fiber with a metal content, cut into various lengths and having varying frequency responses, that are used to reflect electromagnetic energy as a radar countermeasure. These materials, usually dropped from aircraft, also can be deployed from shells or rockets.

from The Century Dictionary.

• To assail with sarcastic banter or raillery; banter; make game of; ridicule; tease; quiz; worry. [Colloq.]
• Synonyms See taunt.
• To use bantering or ironical language by way of ridicule, teasing, or quizzing.
• noun Banter; sarcastic or teasing raillery.
• To cut into chaff. See chaff, n., 2.
• To mix with chaff.
• To furnish with chaff.
• noun The glumes or husks of wheat, oats, or other grain and grasses, especially when separated from the seed by threshing and winnowing.
• noun Straw cut small for the food of cattle.
• noun Figuratively, paltry refuse; worthless matter, especially that which is light and apt to be driven by the wind.
• noun In botany, the scales or bracts which subtend the individual flowers in the heads of many Compositæ.
• noun A name among fishermen for the finer kinds of seaweed.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To use light, idle language by way of fun or ridicule; to banter.
• noun The glumes or husks of grains and grasses separated from the seed by threshing and winnowing, etc.
• noun Anything of a comparatively light and worthless character; the refuse part of anything.
• noun Straw or hay cut up fine for the food of cattle.
• noun Light jesting talk; banter; raillery.
• noun (Bot.) The scales or bracts on the receptacle, which subtend each flower in the heads of many Compositæ, as the sunflower.
• noun a machine for cutting, up straw, etc., into “chaff” for the use of cattle.
• transitive verb To make fun of; to turn into ridicule by addressing in ironical or bantering language; to quiz.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The inedible parts of a grain-producing plant.
• noun By extension, any excess or unwanted material, resource, or person; anything worthless.
• noun Loose material dropped from aircraft specifically to interfere with radar detection.
• verb intransitive To use light, idle language by way of fun or ridicule; to banter.
• verb transitive To make fun of; to turn into ridicule by addressing in ironical or bantering language; to quiz.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun material consisting of seed coverings and small pieces of stem or leaves that have been separated from the seeds
• noun foil in thin strips; ejected into the air as a radar countermeasure
• verb be silly or tease one another