13-letter words containing l, e, f, t, b, r
- optical fibre — (communications) (fibre optics, FO, US "fiber", light pipe) A plastic or glass (silicon dioxide) fibre no thicker than a human hair used to transmit information using infra-red or even visible light as the carrier (usually a laser). The light beam is an electromagnetic signal with a frequency in the range of 10^14 to 10^15 Hertz. Optical fibre is less susceptible to external noise than other transmission media, and is cheaper to make than copper wire, but it is much more difficult to connect. Optical fibres are difficult to tamper with (to monitor or inject data in the middle of a connection), making them appropriate for secure communications. The light beams do not escape from the medium because the material used provides total internal reflection. See also FDDI, Optical Carrier n, SONET.
- owl butterfly — any of several South American nymphalid butterflies of the genus Caligo, especially C. eurylochus, having a spot like an owl's eye on each hind wing.
- preferability — more desirable.
- reformability — the extent to which something or someone is reformable; the capability or susceptibility to reform
- refundability — to give back or restore (especially money); repay.
- retrofittable — to modify equipment (in airplanes, automobiles, a factory, etc.) that is already in service using parts developed or made available after the time of original manufacture.
- robert fulton — Robert, 1765–1815, U.S. engineer and inventor: builder of the first profitable steamboat.
- rule of thumb — a general or approximate principle, procedure, or rule based on experience or practice, as opposed to a specific, scientific calculation or estimate.
- sea butterfly — any member of the gastropod order Pteropoda, shelled marine mollusks so called for their ability to swim using winglike extensions of the foot.
- self-betrayal — to deliver or expose to an enemy by treachery or disloyalty: Benedict Arnold betrayed his country.
- transferrable — to convey or remove from one place, person, etc., to another: He transferred the package from one hand to the other.
- transformable — to change in form, appearance, or structure; metamorphose.
- uncomfortable — causing discomfort or distress; painful; irritating.
- unforgettable — impossible to forget; indelibly impressed on the memory: scenes of unforgettable beauty.
- unforgettably — impossible to forget; indelibly impressed on the memory: scenes of unforgettable beauty.
- unrectifiable — able to be rectified.
- unvitrifiable — not able to be vitrified
- verifiability — to prove the truth of, as by evidence or testimony; confirm; substantiate: Events verified his prediction.
- water bailiff — an official responsible for enforcing laws on river management and fishing
- water buffalo — a buffalo, Bubalus bubalis, of the Old World tropics, having large, flattened, curved horns: wild populations are near extinction.