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Shade.

1. A colored glass in a sextant or other optical instrument for solar observations.

2. a. A hollow conic frustum of paper or metal surrounding the flame of a lamp, in order to confine the light within a given circular area.

b. A hollow globe of ground glass or other translucent material, used for diffusing the light of a lamp or burner. A clean glass globe obstructs about 12 per cent of the light; when ornamented with cut flowers or figures, about 24 per cent; a globe ground all over, about 40 per cent.

3. A device for protecting the eyes from the direct rays of the sun or artificial light.

4. A window-curtain to exclude light.

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