名詞 doubler:

1. an electronic device that doubles the voltage or the frequency of an input signal

形容詞 double:

1. having more than one decidedly dissimilar aspects or qualities-Frederick Harrison
   同義詞：double, dual, twofold, two-fold, treble, threefold, three-fold
2. consisting of or involving two parts or components usually in pairs
   同義詞：double, dual, duple
3. twice as great or many
   同義詞：double, doubled, twofold, two-fold
4. used of flowers having more than the usual number of petals in crowded or overlapping arrangements
   同義詞：double
5. used of homologous chromosomes associated in pairs in synapsis
   同義詞：bivalent, double
6. large enough for two
   同義詞：double
7. having two meanings with intent to deceive
   同義詞：double, forked

dou.bler

n.（名詞）
A device that doubles the frequency or voltage of an input signal.
倍壓器，倍頻器：將輸入信號的頻率或電壓增強一倍的裝置