lagoon

n. 环礁湖, 近海岸的浅水区, 泻湖, 咸水湖

la.goon

n.（名词）
A shallow body of water, especially one separated from a sea by sandbars or coral reefs.
环礁湖，泻湖：一片浅水湖，尤指在海中由被河口的沙洲或珊瑚礁围成的
A shallow body of liquid waste material, as one in a dump.
一洼废水：由废弃物质充斥的浅水体，如在垃圾堆中

来源：
French lagune
法语 lagune
Italian laguna
意大利语 laguna
both from Latin lacôna [pool, hollow, gap]
都源自 拉丁语 lacôna [水池，中空，裂缝]
from lacus [lake]
源自 lacus [湖泊]