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 Oak n.
 1. Bot. Any tree or shrub of the genus Quercus.  The oaks have alternate leaves, often variously lobed, and staminate flowers in catkins.  The fruit is a smooth nut, called an acorn, which is more or less inclosed in a scaly involucre called the cup or cupule.  There are now recognized about three hundred species, of which nearly fifty occur in the United States, the rest in Europe, Asia, and the other parts of North America, a very few barely reaching the northern parts of South America and Africa. Many of the oaks form forest trees of grand proportions and live many centuries. The wood is usually hard and tough, and provided with conspicuous medullary rays, forming the silver grain.
 2. The strong wood or timber of the oak.
 Note: ☞ Among the true oaks in America are: Barren oak, or Black-jack, Quercus nigra.
 Basket oak, Quercus Michauxii.
 Black oak, Quercus tinctoria; -- called also yellow oak or quercitron oak.
 Bur oak (see under Bur.), Quercus macrocarpa; -- called also over-cup or mossy-cup oak.
 Chestnut oak, Quercus Prinus and Quercus densiflora.
 Chinquapin oak (see under Chinquapin), Quercus prinoides.
 Coast live oak, Quercus agrifolia, of California; -- also called enceno.
 Live oak (see under Live), Quercus virens, the best of all for shipbuilding; also, Quercus Chrysolepis, of California.
 Pin oak. Same as Swamp oak.
 Post oak, Quercus obtusifolia.
 Red oak, Quercus rubra.
 Scarlet oak, Quercus coccinea.
 Scrub oak, Quercus ilicifolia, Quercus undulata, etc.
 Shingle oak, Quercus imbricaria.
 Spanish oak, Quercus falcata.
 Swamp Spanish oak, or Pin oak, Quercus palustris.
 Swamp white oak, Quercus bicolor.
 Water oak, Quercus aquatica.
 Water white oak, Quercus lyrata.
 Willow oak, Quercus Phellos.
     Among the true oaks in Europe are: Bitter oak, or Turkey oak, Quercus Cerris (see Cerris).
 Cork oak, Quercus Suber.
 English white oak, Quercus Robur.
 Evergreen oak, Holly oak, or Holm oak, Quercus Ilex.
 Kermes oak, Quercus coccifera.
 Nutgall oak, Quercus infectoria.
 Note: ☞ Among plants called oak, but not of the genus Quercus, are: African oak, a valuable timber tree (Oldfieldia Africana).
 Australian oak or She oak, any tree of the genus Casuarina (see Casuarina).
 Indian oak, the teak tree (see Teak).
 Jerusalem oak. See under Jerusalem.
 New Zealand oak, a sapindaceous tree (Alectryon excelsum).
 Poison oak, a shrub once not distinguished from poison ivy, but now restricted to Rhus toxicodendron or Rhus diversiloba.
 Silky oak or  Silk-bark oak, an Australian tree (Grevillea robusta).
 Green oak, oak wood colored green by the growth of the mycelium of certain fungi.
 Oak apple, a large, smooth, round gall produced on the leaves of the American red oak by a gallfly (Cynips confluens). It is green and pulpy when young.
 Oak beauty Zool., a British geometrid moth (Biston prodromaria) whose larva feeds on the oak.
 Oak gall, a gall found on the oak. See 2d Gall.
 Oak leather Bot., the mycelium of a fungus which forms leatherlike patches in the fissures of oak wood.
 Oak pruner. Zool. See Pruner, the insect.
 Oak spangle, a kind of gall produced on the oak by the insect Diplolepis lenticularis.
 Oak wart, a wartlike gall on the twigs of an oak.
 The Oaks, one of the three great annual English horse races (the Derby and St. Leger being the others).  It was instituted in 1779 by the Earl of Derby, and so called from his estate.
 To sport one's oak, to be “not at home to visitors,” signified by closing the outer (oaken) door of one's rooms. [Cant, Eng. Univ.]
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 Swamp n.  Wet, spongy land; soft, low ground saturated with water, but not usually covered with it; marshy ground away from the seashore.
    Gray swamps and pools, waste places of the hern.   --Tennyson.
    A swamp differs from a bog and a marsh in producing trees and shrubs, while the latter produce only herbage, plants, and mosses.   --Farming Encyc. (E. Edwards, Words).
 Swamp blackbird. Zool. See Redwing (b).
 Swamp cabbage Bot., skunk cabbage.
 Swamp deer Zool., an Asiatic deer (Rucervus Duvaucelli) of India.
 Swamp hen. Zool. (a) An Australian azure-breasted bird (Porphyrio bellus); -- called also goollema. (b) An Australian water crake, or rail (Porzana Tabuensis); -- called also little swamp hen. (c) The European purple gallinule.
 Swamp honeysuckle Bot., an American shrub (Azalea viscosa syn. Rhododendron viscosa or Rhododendron viscosum) growing in swampy places, with fragrant flowers of a white color, or white tinged with rose; -- called also swamp pink and white swamp honeysuckle.
 Swamp hook, a hook and chain used by lumbermen in handling logs.  Cf. Cant hook.
 Swamp itch. Med. See Prairie itch, under Prairie.
 Swamp laurel Bot., a shrub (Kalmia glauca) having small leaves with the lower surface glaucous.
 Swamp maple Bot., red maple. See Maple.
 Swamp oak Bot., a name given to several kinds of oak which grow in swampy places, as swamp Spanish oak (Quercus palustris), swamp white oak (Quercus bicolor), swamp post oak (Quercus lyrata).
 Swamp ore Min., bog ore; limonite.
 Swamp partridge Zool., any one of several Australian game birds of the genera Synoicus and Excalfatoria, allied to the European partridges.
 Swamp robin Zool., the chewink.
 Swamp sassafras Bot., a small North American tree of the genus Magnolia (Magnolia glauca) with aromatic leaves and fragrant creamy-white blossoms; -- called also sweet bay.
 Swamp sparrow Zool., a common North American sparrow (Melospiza Georgiana, or Melospiza palustris), closely resembling the song sparrow. It lives in low, swampy places.
 Swamp willow. Bot. See Pussy willow, under Pussy.

 Quercus lyrata
      n : medium-large deciduous timber tree of central and southern
          United States; acorns deeply immersed in the cup and
          mature in first year [syn: overcup oak]