| FIR | far infrared; fold increase in resistance |
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| FIR | Finite Impulse Response |
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| riga fir | <botany> A species of pine (Pinus sylvestris), and its wood, which affords a valuable timber; called also Scotch pine, and red or yellow deal. It grows in all parts of Europe, in the Caucasus, and in Siberia. Origin: So called from Riga, a city in Russia. Source: Websters Dictionary (01 Mar 1998) |
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| Riga, Antonio | <person> Italian physician, 1832-1919. See: Riga-Fede disease. (05 Mar 2000) |
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| Riga-Fede disease | Ulceration of the lingual frenum in teething infants, related to abrasion of the tissue against the new central incisors. (05 Mar 2000) |
| sea fir | <zoology> A sertularian hydroid, especially Sertularia abietina, which branches like a miniature fir tree. Source: Websters Dictionary (01 Mar 1998) |
| joint-fir | <botany> A genus (Ephedra) of leafless shrubs, with the stems conspicuously jointed; called also shrubby horsetail. There are about thirty species, of which two or three are found from Texas to California. Source: Websters Dictionary (01 Mar 1998) |
| fir | <botany> A genus (Abies) of coniferous trees, often of large size and elegant shape, some of them valued for their timber and others for their resin. The species are distinguished as the balsam fir, the silver fir, the red fir, etc. The Scoth fir is a Pinus. Fir in the Bible means any one of several coniferous trees, including, cedar, cypress, and probably three species of pine. Origin: Dan. Fyr, fyrr; akin to Sw. Furu, Icel. Fura, AS. Furh in furhwudu fir wood, G. Fohre, OHG. Forha pine, vereheih a sort of oak, L. Quercus ak. Source: Websters Dictionary (01 Mar 1998) |
| fir tree | See Fir. Source: Websters Dictionary (01 Mar 1998) |
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