crater

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crater

 [kra´ter]
an excavated area surrounded by an elevated margin, such as is caused by ulceration.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

cra·ter

(krā'ter),
The most depressed, usually central portion of an ulcer.
Farlex Partner Medical Dictionary © Farlex 2012
References in periodicals archive ?
The Moon * July 2008 Highlighted feature Size (miles) Description (A) Copernicus (L5) 58 Relatively young crater with many secondaries (B) Sinus Iridum (L14) 160 Sparsely cratered Bay of Rainbows (C) Orontius 76 Large, relatively old highland crater L numbers refer to Charles Wood's Lunar 100 list; see SkyandTelescope.com/lunar100.
Even at its current distance, about 300 km from Eros, the craft is revealing a complex, heavily cratered surface, notes NEAR scientist Joseph Veverka of Cornell University.
Simply put, older areas are more heavily cratered than younger ones.