<p><strong>noun</strong></p><ul><li>one of the horny structures forming the principal covering of birds, consisting typically of a hard, tubular portion attached to the body and tapering into a thinner, stemlike portion bearing a series of slender, barbed processes that interlock to form a flat structure on each side.</li><li>kind; character; nature: two boys of the same feather.</li><li>something like a feather, as a tuft or fringe of hair.</li><li>something very light, small, or trivial: Your worry is a mere feather.</li><li>Archery: one of the vanes at the tail of an arrow or dart.</li><li>Carpentry: a spline for joining the grooved edges of two boards.</li><li>Masonry: plug and feathers; a featherlike flaw, especially in a precious stone.</li><li>Machinery: feather key.</li><li>Archaic: attire.</li><li>Obsolete: plumage.</li></ul><p><strong>verb</strong></p><ul><li>(used with object) to provide with feathers, as an arrow.</li><li>to clothe or cover with or as with feathers.</li><li>Rowing: to turn (an oar) after a stroke so that the blade becomes nearly horizontal, and hold it thus as it is moved back into position for the next stroke.</li><li>Aeronautics: to change the blade angle of (a propeller) so that the chords of the blades are approximately parallel to the line of flight.</li><li>to turn off (an engine) while in flight.</li></ul><p><strong>verb</strong></p><ul><li>(used without object) to grow feathers.</li><li>to be or become feathery in appearance.</li><li>to move like feathers.</li><li>Rowing: to feather an oar.</li></ul><p><strong>verb phrase</strong></p><ul><li>South Midland U.S.: to attack (a person, task, or problem) vigorously.</li></ul>