waist

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waist

1. Anatomy the constricted part of the trunk between the ribs and hips
2. the middle part of a ship
3. the middle section of an aircraft fuselage
4. the constriction between the thorax and abdomen in wasps and similar insects
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

waist

[wāst]
(engineering)
The center portion of a vessel or container that has a smaller cross section than the adjacent areas.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

waist

The narrowest thickness of the slab in concrete stairs.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.