Capable of being circuited or traveled around; able to be completed in a circuit or loop.
From circuit plus the suffix -able, meaning capable of. This rare adjective combines the verb circuit with the productive -able suffix to describe things that can form circuits.
The -able suffix is English's favorite way to say 'can be done to this thing.' It's so productive that speakers can slap it onto almost any verb and create a real word: circuitable, drinkable, computable. Native speakers instantly understand brand new -able words.
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