plainsong

美 [ˈpleɪnsɔːŋ]英 [ˈpleɪnsɒŋ]

plainsong

noun

U素歌（中世纪以来的教堂音乐）
a type of church music for voices alone, used since the Middle Ages

noun

a liturgical chant of the Roman Catholic Church: Synonym: plainchant Gregorian chant

数据来源：WordNet

1

Of or relating to Pope Gregory I or to the plainsong chants of the Roman Catholic Church .

属于或关于罗马教皇一世或罗马天主教单声圣歌的。
2

A plainsong melody serving as the basis of a polyphonic composition by the addition of contrapuntal voices , as in15th-century polyphony .

固定旋律，固定曲调：与对位声部一起作为一首复调音乐基础的一段素歌旋律，如在15世纪复调音乐中。