名詞 rounder:

1. a dissolute person; usually a man who is morally unrestrained
   同義詞：libertine, debauchee
2. a tool for rounding corners or edges

形容詞 round:

1. having a circular shape
   同義詞：round, circular
2. (of sounds) full and rich
   同義詞：orotund, rotund, round, pear-shaped
3. (mathematics) expressed to the nearest integer, ten, hundred, or thousand
   同義詞：round

round.er

n.（名詞）
One that rounds, especially a tool for rounding corners and edges.
倒圓式倒角工具：尤指把邊和角弄圓的工具
One, such as a security guard, who makes rounds.
巡行者：如來(lái)回巡邏的警衛(wèi)人員
A dissolute person.
浪蕩子，放蕩的人
Sports
【體育運(yùn)動(dòng)】
A boxing match that goes on for a specified number of rounds. Often used in combination:
多回合拳擊賽：持續(xù)一定回合的拳擊賽。常用以構(gòu)成復(fù)合詞：
例句：
a five-rounder.
五回合拳擊賽

rounders (used with a sing. verb)An English ball game similar to baseball.
rounders （與單數(shù)動(dòng)詞連用）跑注式棒球：類(lèi)似棒球的一種英式球賽