filmy fern 1. (noun) any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves Synonyms: film fern Related Words: fern 2. (noun) any fern of the genus Trichomanes having large pinnatifid often translucent fronds; most are epiphytic on tree branches and twigs or terrestrial on mossy banks Synonyms: bristle fern Related Words: Killarney fern, Trichomanes boschianum, Trichomanes reniforme, Trichomanes speciosum, fern, hare's-foot bristle fern, kidney fern

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