three-cornered
adjective/ˌθriː ˈkɔːnəd/
/ˌθriː ˈkɔːrnərd/
[usually before noun]- having three corners
- a three-cornered hat
- involving three people or groups
- a three-cornered contest
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three-cornered
Definition of three-cornered adjective from the Oxford Advanced Learner's Dictionary