A fine net or screen (especially around beds) to protect against mosquitos WordNet 3.0 & Open English WordNet

A mosquito net is a type of meshed curtain that is circumferentially draped over a bed or a sleeping area, to offer the sleeper barrier protection against bites and stings from mosquitos, flies, and other pest insects, and thus against the diseases they may carry. Wikipedia

Fine net used to exclude mosquitos and other biting insects Wikidata

A fine net placed around a bed to protect the occupant against mosquitos and the diseases carried by them OmegaWiki

A fine net, placed around a bed, in a window opening, etc., to provide protection against mosquitoes and other insects, and the diseases carried by them. Wiktionary

Fine net used to protect against mosquitos. Wiktionary (translation)