[ noun ] (physics) a degree on the Fahrenheit scale of temperature
Used in print(Organic Gardening and Farming,...)
The fruit is then cooled to 42 ` F. , a temperature at which it lapses into a sort_of dormant state .(B. J. D. Meeuse, The Story of Pollination....)
The survivors emerge on some nice , sunny day in March or April , when the temperature is close to 50 ` F and there is not too_much wind .(Ross E. McKinney and Howard Edde, "Aerated...)
Very little protozoa activity existed below 40 ` F .
When the temperature reached 32 ` F all protozoan activity ceased ; but as the temperature rose , the numbers of protozoa increased rapidly .
[ noun ] (chemistry) a nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite