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.

crater

/cra·ter/ (kra´ter) an excavated area surrounded by an elevated margin.

crater

a pitlike depression, such as where an ulcer has been surgically removed.

crater

an excavated area surrounded by an elevated margin, as caused by ulceration.
References in periodicals archive ?
This reflects the fact that the highlands are typically a billion years older than the maria and the first billion years of lunar history had a much higher cratering rate.
The rays were thought to disappear in about a billion years, thus their presence indicates recent cratering.
Shaw surmised that the three nodes and any other missing ones actually represent the intersection points of cratering rings that, like the K-T swath, encircle the globe.
This cratering record emphasizes the importance of collisions in the formation of planets and the evolution of their surfaces, and the extensive pounding seen in the lunar landscape records the last episode of heavy cratering, roughly 3.