ex·o·ther·mic 
(ĕk′sō-thûrmĭk) also ex·o·ther·mal (-məl)
(ĕk′sō-thûrmĭk) also ex·o·ther·mal (-məl)adj.
Releasing heat: an exothermic reaction.
ex′o·thermi·cal·ly adv.
- substituent
- substitutability
- substitutable
- substitute
- substitution
- substitutional
- substitutionally
- substitutionary
- substitutive
- substrate
- substrative
- substratum
- substruction
- substructional
- substructural
- substructure
- subsumable
- subsume
- subsumption
- subsumptive
- subsurface
- subteen
- subtemperate
- subtenancy
- subtenant