descant

名词 descant:

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

动词 descant:

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

1. In class he descanted on his favorite writer.
   课堂上他详细论述了自己喜爱的作家。

des.cant

n.（名词）
Also dis.cant [ds.-] Music
也作 dis.cant [ds.-] 【音乐】
An ornamental melody or counterpoint sung or played above a theme.
高音部长曲：歌唱或演奏中高于主旋律的装饰性曲调或对位音
The highest part sung in part music.
高音部：在唱分部乐曲时音调最高的部分
A discussion or discourse on a theme.
评论：就某一主题进行讨论
v.intr.（不及物动词）
des.cant.ed,des.cant.ing,des.cants[dμs.k2nt., dμ-sk2nt.]
To comment at length; discourse:
详论：详细评论；论述：
例句：
.He used to descant critically on the dishes which had been at table.(James Boswell)
.他过去常常对端上桌的菜肴大加批评.(詹姆斯·博斯韦尔)

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

来源：
Middle English
中古英语
from Anglo-Norman descaunt
源自 英法语 descaunt
from Medieval Latin discantus [a refrain]
源自 中世纪拉丁语 discantus [叠韵]
Latin dis- [dis-]
拉丁语 dis- [前缀，表强调]
Latin cantus [song]
拉丁语 cantus [歌曲]
from [past participle of] canere [to sing] * see kan-
源自 [] canere的过去分词 [演唱] *参见 kan-

【引伸】
des.cant.er
n.（名词）