| flywheel |
a heavy-rimmed wheel that rotates on a shaft and with its momentum serves to minimize variation in the speed of machinery connected to the shaft. |
| FM |
a system of varying a radio signal's frequency so as to impose the signal on a carrier wave; frequency modulation. [2 definitions] |
| Fm |
symbol of the chemical element fermium. |
| FNMA |
abbreviation of "Federal National Mortgage Association;" Fannie Mae. |
| f-number |
the relative aperture of a camera lens, representing the light it will transmit, which is obtained by dividing the focal length of the lens by the diameter of the aperture. |
| foal |
a young horse, mule, or related animal, esp. under one year old. [2 definitions] |
| foam |
a usu. whitish mass of small bubbles that forms on the surface of a liquid after agitation, fermentation, or the like; froth. [6 definitions] |
| foamable |
combined form of foam. |
| foamless |
combined form of foam. |
| foam rubber |
a firm, lightweight spongy rubber, used esp. in upholstered seats and for mattresses. |
| foamy |
made of, full of, or covered with foam. [2 definitions] |
| fob1 |
a short chain, strap, or ribbon usu. connected to a pocket watch, or a small ornament or medallion attached to the chain, strap, or ribbon. [2 definitions] |
| fob2 |
to dispose of (an item or items) in a deceitful way (usu. fol. by "off"). [2 definitions] |
| focal |
of or relating to focus. |
| focalize |
in medicine, to limit or be limited to a specific area, as an infection; localize. |
| focal length |
the distance between the optical center of a lens or curved mirror and the far distant point where light rays converge upon an object. |
| foci |
a plural form of "focus." |
| fo'c's'le |
variant of forecastle. |
| focus |
the point at which rays, esp. optical, come together, or from which they seem to radiate. [9 definitions] |
| focusable |
combined form of focus. |
| focusless |
combined form of focus. |