Akademik
crater
The most
depressed
, usually central
portion
of an
ulcer
.
* * *
cra·ter
'krāt-ər
n
an eroded lesion of a wall or surface
<ulcer \crater
s
>
* * *
cra·ter
(kraґt
ə
r) a circular area of depression surrounded by an elevated margin.
Medical dictionary
.
2011
.