名詞 descant:

1. a decorative musical accompaniment (often improvised) added above a basic melody
   同義詞：discant

動(dòng)詞 descant:

1. sing in descant
2. sing by changing register; sing by yodeling
   同義詞：yodel, warble
3. talk at great length about something of one's interest

1. In class he descanted on his favorite writer.
   課堂上他詳細(xì)論述了自己喜愛(ài)的作家。

des.cant

n.（名詞）
Also dis.cant [ds.-] Music
也作 dis.cant [ds.-] 【音樂(lè)】
An ornamental melody or counterpoint sung or played above a theme.
高音部長(zhǎng)曲：歌唱或演奏中高于主旋律的裝飾性曲調(diào)或?qū)ξ灰?/br>The highest part sung in part music.
高音部：在唱分部樂(lè)曲時(shí)音調(diào)最高的部分
A discussion or discourse on a theme.
評(píng)論：就某一主題進(jìn)行討論
v.intr.（不及物動(dòng)詞）
des.cant.ed,des.cant.ing,des.cants[dμs.k2nt., dμ-sk2nt.]
To comment at length; discourse:
詳論：詳細(xì)評(píng)論；論述：
例句：
.He used to descant critically on the dishes which had been at table.(James Boswell)
.他過(guò)去常常對(duì)端上桌的菜肴大加批評(píng).(詹姆斯·博斯韋爾)

Also dis.cant [ds.k2nt., d-sk2nt.] Music
也作 dis.cant [ds.k2nt., d-sk2nt.] 【音樂(lè)】
To sing or play a descant.
演唱（或演奏）高音部
To sing melodiously.
甜美地演唱

來(lái)源：
Middle English
中古英語(yǔ)
from Anglo-Norman descaunt
源自 英法語(yǔ) descaunt
from Medieval Latin discantus [a refrain]
源自 中世紀(jì)拉丁語(yǔ) discantus [疊韻]
Latin dis- [dis-]
拉丁語(yǔ) dis- [前綴，表強(qiáng)調(diào)]
Latin cantus [song]
拉丁語(yǔ) cantus [歌曲]
from [past participle of] canere [to sing] * see kan-
源自 [] canere的過(guò)去分詞 [演唱] *參見(jiàn) kan-

【引伸】
des.cant.er
n.（名詞）