subcontrary
noun
sub·con·trary ˌsəb-ˈkän-ˌtrer-ē 
: a proposition so related to another that though both may be true they cannot both be false
subcontrary adjective
Word History
First Known Use
1657, in the meaning defined above
- natural disaster
- natural dualism
- natural dye
- natural English
- natural family planning
- natural food
- natural foods
- natural frequency
- natural function
- natural gas
- natural gasoline
- natural gender
- natural glass
- natural harmonic
- natural hexachord
- natural historian
- natural history
- natural horn
- natural key
- natural killer cell
- natural language
- natural law
- natural leader
- natural life
- natural light