| fast neutrons | Neutrons, the energy of which exceeds some arbitrary level, usually around one million electron volts. (12 Dec 1998) |
|---|---|
| fast pyrolysis | Thermal conversion of biomass by rapid heating to between 450> To 600>C in the absence of oxygen. (05 Dec 1998) |
| fast ray | <microscopy> The fast ray or fast component for a crystal or fibre corresponds to the lower refractive index. (05 Aug 1998) |
| fast smear | A cytologic smear containing material from the vaginal pool and pancervical scrapings, mixed and prepared on one microscopic slide, smeared, and fixed immediately; used principally for routine screening of ovaries, endometrium, cervix, vagina, and hormonal states. (05 Mar 2000) |
| fasten | To fix one's self; to take firm hold; to clinch; to cling. "A horse leech will hardly fasten on a fish." (Sir T. Browne) Source: Websters Dictionary (01 Mar 1998) |
| fasti | 1. The Roman calendar, which gave the days for festivals, courts, etc, corresponding to a modern almanac. 2. Records or registers of important events. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
| fastidious | Having to do with microorganisms which have unusual and/or complex nutritional needs and must be grown on enriched media. (09 Oct 1997) |
| fastidious organism | A bacterial organism having complex nutritional requirements. (05 Mar 2000) |
| fastidium cibi | Rarely used term for fickle or finicky appetite, caused by distaste for food. Origin: L. (05 Mar 2000) |
| fastigatum | Synonym: fastigial nucleus. Origin: L. Fastigatus, pointed (05 Mar 2000) |
| fastigial nucleus | The most medial of the cerebellar nuclei, lying medial to the interpositus nucleus, near the midline, in the white matter underneath the vermis of the cerebellar cortex. It receives the axons of Purkinje cells from all parts of the vermis. Its major projection is to the vestibular nuclei and medullary reticular formation. Synonym: nucleus fastigii, fastigatum, nucleus tecti, roof nucleus, tectal nucleus. (05 Mar 2000) |
| fastigiated | 1. Narrowing towards the top. 2. <botany> Clustered, parallel, and upright, as the branches of the Lombardy poplar; pointed. 3. <zoology> United into a conical bundle, or into a bundle with an enlarged head, like a sheaf of wheat. Origin: L. Fastigium gable end, top, height, summit. Source: Websters Dictionary (01 Mar 1998) |
| fastigiobulbar fibres | Nerve fibres projecting from the fastigial nuclei of the cerebellum to the brain stem; crossed and uncrossed fibres that terminate mainly in the vestibular and reticular nuclei, and in the medial accessory olivary nucleus. (05 Mar 2000) |
| fastigiobulbar tract | A fibre bundle originating in the fastigial nucleus (nucleus tecti) of both sides, passing out of the cerebellum in the inferior cerebellar peduncle (corpus restiforme), and distributing its fibres to the vestibular nuclei and other cell groups in the medulla oblongata. Prominent crossed fibres loop over the dorsal surface of the superior cerebellar peduncle before turning ventrally, forming the uncinate bundle of Russell. Synonym: tractus fastigiobulbaris. (05 Mar 2000) |
| fastigiospinal fibres | Crossed descending fibres originating in the fastigial nucleus of the cerebellum and ending in the spinal cord gray matter at cervical, and possibly lower, levels. (05 Mar 2000) |