cor-

Multiple Entries:
  cor-    com-  

Concise Oxford English Dictionary © 2008 Oxford University Press:
cor-/kɒ/
prefix variant spelling of com-. assimilated before r (as in corrode, corrugate).

Concise Oxford English Dictionary © 2008 Oxford University Press:
com- /kɒm/ (also co-, col-, con-, or cor-)
prefix with; together; jointly; altogether: combine.
– origin from L. cum ‘with’.
'cor-' also found in these Oxford entries:

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