Definition of underfloor adjective from the Oxford Advanced Learner's Dictionary

 

underfloor

 adjective
adjective
BrE BrE//ˌʌndəˈflɔː(r)//
 
; NAmE NAmE//ˌʌndərˈflɔːr//
 
[only before noun]
 
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placed underneath the floor underfloor heating
See the Oxford Advanced American Dictionary entry: underfloor