degree - a unit of temperature on a specified scale; "the game was played in spite of the 40-degree temperature"

chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

cryolite, Greenland spar - a white mineral consisting of fluorides of aluminum and sodium; a source of fluorine

fluorapatite - a form of apatite in which fluorine predominates over chlorine

fluor, fluorite, fluorspar - a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine

gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely

halogen - any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions

capacitance unit - a measure of the capacity of a circuit component to store charge

millifarad - a unit of capacitance equal to one thousandth of a farad

abfarad - a capacitance unit equal to one billion farads

Latin alphabet, Roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"