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  • fossil

    The remains of an animal or plant found in rocks.

  • fracture

    The breaking of a bone into two or more pieces

  • fragment

    Use for portions of something that are torn, broken off from, or dislocated from their original whole.

  • free pass

    A concessionary ticket permitting free travel.

  • freezing microtome

    An instrument in which tissue is frozen using ice salt or ether before being sliced in order to be examined under a microscope.

  • frigate

    Uses both for naval ships of the late 18th and early 19th centuries generally fully rigged on three masts and armed with guns on one or two decks and designed for various battle functions, and for a contemporary class of small, medium-speed warships designed primarily for escort duty and having antiair, antiship, and antisubmarine capabilities

  • fruit van

    A ventilated railway van used for the carraige of fresh fruit.

  • fullers earth

    An adsorbent clay that can be used to filter and purify animal or vegetable oils and greases.

  • fumigation

    A method of pest control in which an area is filled with pesticide gas in order to poison or suffocate the pests within.

  • fumigator

    An object used to disinfect or purify the air with fumes, often used to eradicate pest infestations from buildings.

  • fundraising

    The process of soliciting and gathering money or other gifts in-kind, by requesting donations from individuals, businesses, charitable foundations, or governmental agencies. Although fundraising typically refers to efforts to gather funds for non-profit organizations, it is sometimes used to refer to the identification and solicitation of investors or other sources of capital for-profit enterprises.

  • furnace

    An enclosed chamber or container used to burn biomass in a controlled manner to produce heat.

  • fuselage

    The complete central structure of aircraft, to which the wings, tail assemblies, and engines may be attached. In the early 20th century, the term was taken from French specifically to refer to the framework of the body of an airplane, particularly the girder-like backbone employed in airplane design; it has since come to mean the entire central structure of the aircraft.

  • fusible plug

    A lead plug in the firebox crown of a steam locomotive which melts if the water level in the boiler falls below the level of the firebox extinguishing the fire thus preventing boiler explosion.

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