seine

In everyday English, a seine is a fishing net. It is usually a long net that hangs in the water and is pulled in to catch fish, especially fish that swim together in groups. People may talk about a beach seine or a haul seine, depending on how and where the net is used. This is the main meaning of the word in general English, although it appears more often in fishing, coastal life, and nature writing than in casual conversation.

There is also a famous proper noun: the Seine, the river that runs through Paris. Because that river is so well known, many learners first meet the word as a place name. Still, when the word is written in lowercase and used as a common noun, it usually means the fishing net.

At its core, a seine is a fishing net designed to surround or sweep up fish. The net is usually hung vertically in the water, often with floats at the top and weights at the bottom, so it forms a moving wall. Fishermen then pull it in, trapping fish inside. This is why the word often appears in phrases such as seine net, purse seine, and seining. You are most likely to see it in writing about fishing, marine life, traditional work on the coast, or environmental field studies.

The word is somewhat specialized, so many English learners do not meet it early. Still, it is useful because it names a specific method of catching fish rather than fishing in general. If someone says a boat is seining, they mean the crew is using this kind of net to gather fish from the water.

At the same time, Seine with a capital S is the name of the famous river in France that flows through Paris. That proper-noun use is widely known around the world and often feels more familiar than the common noun. Context usually makes the meaning clear: in a sentence about nets, boats, or fish, seine means the fishing tool; in a sentence about Paris, bridges, or France, Seine means the river.