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circular plane[′sər·kyə·lər ′plān]
A plane that can be adjusted for convex or concave surfaces.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A plane having a curved base-plate (either concave or convex); for smoothing curved woodwork.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.