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The rim of a volcano.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(1) The name of a semicircular dome that is part of an ancient volcano near the Vesuvius crater.

(2) The name for a nested crater consisting of an old volcano at varying stages of destruction that includes a younger volcanic cone in its caldera or crater. Examples of sommas are Mount Somma, which surrounds Vesuvius, and Avachinskaia Sopka on Kamchatka.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Her Sankei boss proved to be ''very supportive'' of Somma's artistic endeavors, even attending the reading.
LEEDS: Schmeichel, Connolly (Bromby 83), Bruce, O'Brien McCartney, Snodgrass, Howson, Johnson, Gradel Becchio (Paynter 88), Somma (Kilkenny 79).
LEEDS: Brown, Connolly, Naylor, Collins, McCartney (Hughes 34), Snodgrass, Faye (Bromby 85), Howson, Watt (Johnson 38), Somma, Becchio.
Several plants have suspended production, Di Somma said, declining to name those plants.
Inspired by his success in Dubai, Di Somma participated in races for his age category around the world last year and came first in London, Copenhagen and New York.
Somma is only one of the colorful characters included in the book which is full of historical narrative and anecdotes.
Somma's book 'After the Rain: A New Adventure for Peter Pan' was published in September 2002 and has been distributed in Canada and the United States.
This June the company will make the new Ortho Dialpak available to users of its Ortho Tri-Cyclen tablets, the most prescribed oral contraceptive in the United States, according to Somma, and Ortho-Cyclen tablets.
SOMMA: This market, Somma has tapped the computer industry in packaging a dealer incentive showroom promotion that dovetails with a subsequent summer consumer-driven retail traffic-builder campaign.
David Somma is still injured but Billy Paynter could return after a thigh strain.
LEEDS: Schmeichel 6, O'Brien 7, Bruce 6, Lichaj 6, McCartney 5, Kilkenny 6 (Somma 73, 7), Johnson 6, Howson 7, Gradel 7, Snodgrass 7, Becchio 6 (Paynter, 89) Goals: Becchio 16, Somma 75