Hollow

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hollow

[′häl·ō]
(science and technology)
Having a concave surface.
Having an interior cavity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

What does it mean when you dream about something hollow?

Something that is hollow retains the outer form, but is missing the core, the substance. A dream about a hollow object can reflect a feeling that despite the fact that everything is outwardly okay, something essential is missing.

The Dream Encyclopedia, Second Edition © 2009 Visible Ink Press®. All rights reserved.

cavetto, gorge, hollow, throat, trochilus

examples of a cavetto
A hollow member or round concave molding containing at least the quadrant of a circle, used in cornices and between the tori of bases, etc. Erroneously called scotia, which has a noncircular curvature.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.