invisible : Idioms & Phrases
invisible balance
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noun the difference in value over a period of time of a country's imports and exports of services and payments of property incomes
WordNet
Invisible bird
(Zoöl.) , a small, shy singing bird (Myadestes sibilons ), of St. Vincent Islands.
Webster 1913
Invisible green
- a very dark shade of green, approaching to black, and liable to be mistaken for it.
