Name roots...

[Dr. Andrew Kropinski]

A good place to find the origins of these words is in Hans G. Schlegel 
"General Microbiology" (7th. Edn., Cambridge University Press)
    thermos (Greek) warm
    psychros (Greek) cool or cold
    philos (Greek) friend
    mesos (Greek) the middle one
    trophe (Greek) food
    duro, durare (Latin) hardening, enduring
 N.B. A good standard dictionary would also be a good place to find the 
roots of these words.
                         Andrew