|a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.|
|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|1.||not visible; not able to be perceived by the eye: invisible rays|
|2.||concealed from sight; hidden|
|3.||not easily seen or noticed: invisible mending|
|4.||kept hidden from public view; secret; clandestine|
|5.||economics of or relating to services rather than goods in relation to the invisible balance: invisible earnings|
|6.||economics an invisible item of trade; service|
in economics, the exchange of physically intangible items between countries. Invisible trade can be distinguished from visible trade, which involves the export, import, and reexport of physically tangible goods. Basic categories of invisible trade include services (receipts and payments arising from activities such as customer service or shipping); income from foreign investment in the form of interest, profits, and dividends; private or government transfers of monies from one country to another; and intellectual property and patents. (See also intellectual-property law.
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