pentad
n . 五個一組;五年間;五價元素
五個一組;五年間;五價元素
pentad n 1 :
the cardinal number that is the sum of four and one [
synonym :
{
five }, {
5 }, {
V }, {
cinque }, {
quint }, {
quintet }, {
fivesome },
{
quintuplet }, {
pentad }, {
fin }, {
Phoebe }, {
Little Phoebe }]
Pentad \
Pen "
tad \,
n . [
Gr .
penta `
s penta `
dos ,
a body of five ,
fr .
pe `
nte five .] (
Chem .)
Any element ,
atom ,
or radical ,
having a valence of five ,
or which can be combined with ,
substituted for ,
or compared with ,
five atoms of hydrogen or other monad ;
as ,
nitrogen is a pentad in the ammonium compounds .
[
1913 Webster ]
2 .
Any grouping of five things .
[
PJC ]
Pentad \
Pen "
tad \,
a . (
Chem .)
Having the valence of a pentad .
[
1913 Webster ]
Pentadactyl
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