crater

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crater

 [kra´ter]
an excavated area surrounded by an elevated margin, such as is caused by ulceration.

cra·ter

(krā'ter),
The most depressed, usually central portion of an ulcer.
References in periodicals archive ?
But the outflow features seen by MGS are craterless. Some also appear dust-free -- despite an environment where grit-choked winds are common.