y 音标拼音: [w'ɑɪ]
n . 字母
y 字母
y Y 蓝--黄
Y n 1 :
a silvery metallic element that is common in rare -
earth minerals ;
used in magnesium and aluminum alloys [
synonym :
{
yttrium }, {
Y }, {
atomic number 39 }]
2 :
the 25th letter of the Roman alphabet [
synonym : {
Y }, {
y }, {
wye }]
Y \
Y \ (
w [
imac ]),
n .;
pl . {
Y '
s } (
w [
imac ]
z )
or {
Ys }.
Something shaped like the letter Y ;
a forked piece resembling in form the letter Y .
Specifically :
(
a )
One of the forked holders for supporting the telescope of a leveling instrument ,
or the axis of a theodolite ;
a wye .
(
b )
A forked or bifurcated pipe fitting .
(
c ) (
Railroads )
A portion of track consisting of two diverging tracks connected by a cross track .
[
1913 Webster ]
{
Y level } (
Surv .),
an instrument for measuring differences of level by means of a telescope resting in Y '
s .
{
Y moth } (
Zool .),
a handsome European noctuid moth {
Plusia gamma })
which has a bright ,
silvery mark ,
shaped like the letter Y ,
on each of the fore wings .
Its larva ,
which is green with five dorsal white species ,
feeds on the cabbage ,
turnip ,
bean ,
etc .
Called also {
gamma moth },
and {
silver Y }.
[
1913 Webster ]
Y \
Y \ (
w [
imac ]).
Y ,
the twenty -
fifth letter of the English alphabet ,
at the beginning of a word or syllable ,
except when a prefix (
see Y -),
is usually a fricative vocal consonant ;
as a prefix ,
and usually in the middle or at the end of a syllable ,
it is a vowel .
See Guide to Pronunciation , [
sect ][
sect ]
145 ,
178 -
9 ,
272 .
[
1913 Webster ]
Note :
It derives its form from the Latin Y ,
which is from the Greek [
Upsilon ],
originally the same letter as V .
Etymologically ,
it is most nearly related to u ,
i ,
o ,
and j .
g ;
as in full ,
fill ,
AS .
fyllan ;
E .
crypt ,
grotto ;
young ,
juvenile ;
day ,
AS .
d [
ae ]
g .
See {
U }, {
I },
and {
J }, {
G }.
[
1913 Webster ]
Note :
Y has been called the Pythagorean letter ,
because the Greek letter [
Upsilon ]
was taken to represent the sacred triad ,
formed by the duad proceeding from the monad ;
and also because it represents the dividing of the paths of vice and virtue in the development of human life .
[
1913 Webster ]
Y \
Y \ ([
imac ]),
pron .
I . [
Obs .] --
King Horn . --
Wyclif .
[
1913 Webster ]
Y
Y - \
Y -\,
or I - \
I -\ . [
OE .
y -,
i -,
AS .
ge -,
akin to D . &
G .
ge -,
OHG .
gi -,
ga -,
Goth .
ga -,
and perhaps to Latin con -;
originally meaning ,
together .
Cf . {
Com -}, {
Aware }, {
Enough },
{
Handiwork }, {
Ywis }.]
A prefix of obscure meaning ,
originally used with verbs ,
adverbs ,
adjectives ,
nouns ,
and pronouns .
In the Middle English period ,
it was little employed except with verbs ,
being chiefly used with past participles ,
though occasionally with the infinitive .
Ycleped ,
or yclept ,
is perhaps the only word not entirely obsolete which shows this use .
[
1913 Webster ]
That no wight mighte it see neither yheere . --
Chaucer .
[
1913 Webster ]
Neither to ben yburied nor ybrent . --
Chaucer .
[
1913 Webster ]
Note :
Some examples of Chaucer '
s use of this prefix are ;
ibe ,
ibeen ,
icaught ,
ycome ,
ydo ,
idoon ,
ygo ,
iproved ,
ywrought .
It inough ,
enough ,
it is combined with an adjective .
Other examples are in the Vocabulary .
[
1913 Webster ]
Spenser and later writers frequently employed this prefix when affecting an archaic style ,
and sometimes used it incorrectly .
[
1913 Webster ]
1 .
General purpose language syntactically like {
RATFOR },
semantically like {
C }.
Lacks structures and pointers .
Used
as a source language for Jack W .
Davidson and Christopher
W .
Fraser '
s peephole optimiser which inspired {
GCC } {
RTL }
and
other optimisation ideas .
{(
ftp ://
ftp .
cs .
princeton .
edu /
pub /
y po .
tar .
Z )}.
It is a copy
of the original distribution from the {
University of Arizona }
during the early 80 '
s ,
totally unsupported .
["
The Y Programming Language ",
D .
R .
Hanson ,
SIGPLAN Notices
16 (
2 ):
59 -
68 (
Feb 1981 )].
[
Jack W .
Davidson and Christopher W .
Fraser , "
The Design and
Application of a Retargetable Peephole Optimiser ",
TOPLAS ,
Apr .
1980 ].
[
Jack W .
Davidson , "
Simplifying Code Through Peephole
Optimisation "
Technical Report TR81 -
19 ,
The University of
Arizona ,
Tucson ,
AZ ,
1981 ].
[
Jack W .
Davidson and Christopher W .
Fraser , "
Register
Allocation and Exhaustive Peephole Optimisation "
Software -
Practice and Experience ,
Sep .
1984 ].
2 .
See {
fixed point combinator }.
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