a three-layered fishing net, the middle layer of which is fine-meshed, the others coarse-meshed, so that fish attempting to pass through the net will become entangled in one or more of the meshes.
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How to use trammel net in a sentence
A trammel net may be used under the ice by cutting two holes through it at a convenient distance apart.
I have never really cared for muskrats since as a lad I caught twenty of them one night in a trammel net.The Tent Dwellers | Albert Bigelow Paine
I get just such oddities any time I lift my trammel net, but they are thrown away as "trash."From Edinburgh to India & Burmah | William G. Burn Murdoch