protuberance
noun /prəˈtjuːbərəns/
/prəʊˈtuːbərəns/
(formal)- a round part that sticks out from a surface
突出物；隆起部分 - The diseased trees are marked by protuberances on their trunks.
患病的树木树干上有突起物。
- The diseased trees are marked by protuberances on their trunks.