Also found in: Acronyms.
nominal diameter[′näm·ə·nəl dī′am·əd·ər]
The diameter computed for a hypothetical sphere which would have the same volume as the calculated volume for a specific sedimentary particle. Also known as equivalent diameter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A designation used to specify the size of a pipe, bolt, rivet, reinforcing steel bar, or rod, not necessarily equal to the exact diameter.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.