acorn 音标拼音: ['ekɔrn]
n . 橡实,橡子
橡实,橡子
acorn 橡实管
acorn n 1 :
fruit of the oak tree :
a smooth thin -
walled nut in a woody cup -
shaped base Acorn \
A "
corn \,
n . [
AS . [
ae ]
cern ,
fr . [
ae ]
cer field ,
acre ;
akin to D .
aker acorn ,
Ger .
ecker ,
Icel .
akarn ,
Dan .
agern ,
Goth .
akran fruit ,
akrs field ; --
orig .
fruit of the field .
See {
Acre }.]
1 .
The fruit of the oak ,
being an oval nut growing in a woody cup or cupule .
[
1913 Webster ]
2 . (
Naut .)
A cone -
shaped piece of wood on the point of the spindle above the vane ,
on the mast -
head .
[
1913 Webster ]
3 . (
Zool .)
See {
Acorn -
shell }.
[
1913 Webster ]
Oak \
Oak \ ([=
o ]
k ),
n . [
OE .
oke ,
ok ,
ak ,
AS . [=
a ]
c ;
akin to D .
eik ,
G .
eiche ,
OHG .
eih ,
Icel .
eik ,
Sw .
ek ,
Dan .
eeg .]
[
1913 Webster ]
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 .
[
1913 Webster ]
2 .
The strong wood or timber of the oak .
[
1913 Webster ]
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 }.
[
1913 Webster ]
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 }.
[
1913 Webster ]
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 }).
[
1913 Webster ]
{
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 .]
[
1913 Webster ]
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