filmy fern
- n 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
- n any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves
filoviridae
- n a family of threadlike RNA viruses that cause diseases in humans and nonhuman primates (monkeys and chimpanzees)
fils
- n 100 Yemeni fils are worth one Yemeni rial
- n a fractional monetary unit in Bahrain and Iraq and Jordan and Kuwait; equal to one thousandth of a dinar
filter
- n device that removes something from whatever passes through it
- n an electrical device that alters the frequency spectrum of signals passing through it
- v remove by passing through a filter
filter out the impurities - v pass through
- v run or flow slowly, as in drops or in an unsteady stream