It's really rare to use this word. Literally, I think it means manger which provide food to animals. But actually, when we refer to manger, we use 食槽 more often.

Could you provide me a sentence or tell me where did you find this word? Because I do not understand either though I'm a native speaker... "餐“means food. "槽” is a kind of container. But I do not know weather there is a special meaning. So, leave me a message if you need.