sub·field 
(sŭbfēld′)
(sŭbfēld′)n.
1. A subdivision of a field of study; a subdiscipline.
2. Mathematics A field that is a subset of another field.
- teacart
- tea ceremony
- teach
- Teach
- teachability
- teachable
- teachableness
- teachably
- teacher
- teacher bird
- teacherly
- teachers college
- teachers' college
- teacher's pet
- teach-in
- teaching
- teaching assistant
- teaching assistantship
- teaching fellow
- teaching hospital
- teaching machine
- teacup
- teacupful
- tea dance
- tea garden