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annular vault[′an·yə·lər ′vȯlt]
A vault arising from circular walls.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
barrel vault in the shape of a ring, instead of a straight line; covers a space of which the plan is formed by the area between two concentric circles, or any portion of such a space.A
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.