Among the true oaks in America are: Barren oak, or Black-jack, Q.
nigra. -- Basket oak, Q. Michauxii. -- Black oak, Q. tinctoria; --
called also yellow or quercitron oak. -- Bur oak (see under Bur.), Q.
macrocarpa; -- called also over-cup or mossy-cup oak. -- Chestnut oak,
Q. Prinus and Q. densiflora. -- Chinquapin oak (see under Chinquapin),
Q. prinoides. -- Coast live oak, Q. agrifolia, of California; -- also
called enceno. -- Live oak (see under Live), Q. virens, the best of all
for shipbuilding; also, Q. Chrysolepis, of California. -- Pin oak. Same
as Swamp oak. - - Post oak, Q. obtusifolia. -- Red oak, Q. rubra. --
Scarlet oak, Q. coccinea. -- Scrub oak, Q. ilicifolia, Q. undulata,
etc. -- Shingle oak, Q. imbricaria. -- Spanish oak, Q. falcata. --
Swamp Spanish oak, or Pin oak, Q. palustris. -- Swamp white oak, Q.
bicolor. -- Water oak, Q. aguatica. -- Water white oak, Q. lyrata. --
Willow oak, Q. Phellos.
Among the true oaks in Europe are: Bitter oak, or Turkey oak, Q. Cerris
(see Cerris). -- Cork oak, Q. Suber. -- English white oak, Q. Robur. --
Evergreen oak, Holly oak, or Holm oak, Q. Ilex. -- Kermes oak, Q.
coccifera. -- Nutgall oak, Q. infectoria.
Among plants called oak, but not of the genus Quercus, are: African
oak, a valuable timber tree (Oldfieldia Africana). -- Australian, 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, the poison ivy. See under Poison. -- Silky, 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 (Zoöl.), 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. (Zoöl.) 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.]
Oak"en (?), a. [AS. cen.] Made or consisting of oaks or of the wood of
oaks. "In oaken bower." Milton.
Oaken timber, wherewith to build ships.
Bacon.
Oak"er (?), n. See Ocher. [Obs.] Spenser.
Oak"ling (?), n. A young oak. Evelyn.
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Oak"um (?), n. [AS. cumba; pref. &?; (cf.G. er-, Goth. us-, orig.
meaning, out) + cemban to comb, camb comb. See Comb.] 1. The material
obtained by untwisting and picking into loose fiber old hemp ropes; --
used for calking the seams of ships, stopping leaks, etc.