動(dòng)詞 attenuate:

1. weaken the consistency of (a chemical substance)
   同義詞：rarefy
2. become weaker, in strength, value, or magnitude

形容詞 attenuate:

1. reduced in strength
   同義詞：attenuated, faded, weakened

at.ten.u.ate

v.（動(dòng)詞）
at.ten.u.at.ed,at.ten.u.at.ing,at.ten.u.ates
v.tr.（及物動(dòng)詞）
To make slender, fine, or small.
使減細(xì)，使減小；使減弱，使變薄
To reduce in force, value, amount, or degree; weaken.
使減弱：在力量、價(jià)值、數(shù)值或程度上減小
To lessen the density of; rarefy.
稀釋：減弱集中程度；使變稀薄
Biology To make (bacteria or viruses) less virulent.
【生物學(xué)】 使病毒減弱：減弱（細(xì)菌或真菌）的毒性
Electronics To reduce (the amplitude of an electrical signal) with little or no distortion.
【電子學(xué)】 減弱訊號(hào)：在失真極小或不失真的情況下減弱（調(diào)幅或電子訊號(hào)）
v.intr.（不及物動(dòng)詞）
To become thin, weak, or fine.
變細(xì)、變?nèi)趸蜃冃?/br>adj.（形容詞）

Reduced or weakened, as in strength, value, or virulence.
細(xì)弱的：指在力度、價(jià)值或毒性上減少或變?nèi)?/br>Botany Gradually tapering to a slender point.
【植物學(xué)】 漸狹的：至尖端逐漸變細(xì)的

來(lái)源：
Latin attenu3re attenu3t-
拉丁語(yǔ) attenu3re attenu3t-
ad- [ad-]
ad- [前綴，表示.（運(yùn)動(dòng)的）方向.，.變化.]
tenu3re [to make thin] from tenuis [thin] * see ten-
tenu3re [變細(xì)] 源自 tenuis [細(xì)] *參見(jiàn) ten-

【引伸】
atten.ua.tion
n.（名詞）