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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
international unit n.
Abbr. IU
The quantity of a biologically active substance, such as a hormone or vitamin, required to produce a specific response.
A unit of potency for similarly active substances, based on this quantity and accepted as an international standard.
| international unit
A unit for measuring a biologically active substance, such as a hormone or vitamin. |