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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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 Scar·let, a. Of the color called scarlet; as, a scarlet cloth or thread.
 Scarlet admiral Zool., the red admiral. See under Red. -- Scarlet bean Bot., a kind of bean (Phaseolus multiflorus) having scarlet flowers; scarlet runner.
 Scarlet fever Med., a contagious febrile disease characterized by inflammation of the fauces and a scarlet rash, appearing usually on the second day, and ending in desquamation about the sixth or seventh day.
 Scarlet fish Zool., the telescope fish; -- so called from its red color. See under Telescope.
 Scarlet ibis Zool. See under Ibis.
 Scarlet maple Bot., the red maple. See Maple.
 Scarlet mite Zool., any one of numerous species of bright red carnivorous mites found among grass and moss, especially Thombidium holosericeum and allied species. The young are parasitic upon spiders and insects.
 Scarlet oak Bot., a species of oak (Quercus coccinea) of the United States; -- so called from the scarlet color of its leaves in autumn.
 Scarlet runner Bot., the scarlet bean.
 Scarlet tanager. Zool. See under Tanager.

 Quercus coccinea
      n : medium-large deciduous tree with a thick trunk found in the
          eastern United States and southern Canada and having
          close-grained wood and deeply 7-lobed leaves turning
          scarlet in autumn [syn: scarlet oak]