Answer:

atrial

AnswerCrossword Clue
ATRIALOn .. basis
ATRIALConcerning a heart chamber
ATRIALOf an upper heart chamber
ATRIALOf a body chamber
ATRIALOf a heart part
ATRIALOf a heart chamber
ATRIAL... septal defect (heart problem)
ATRIALOf Roman rooms
ATRIALHaving a courtyard
ATRIALLike part of the heart
ATRIALLike some chambers
ATRIALOn -- basis (for testing out)
ATRIALHearty, in a way
ATRIALHaving an open courtyard
ATRIALOn ... basis
ATRIALOn ... basis (for testing purposes)
ATRIALOn ... basis (for trying out)
ATRIALLike some fibrillation
ATRIALKind of fibrillation
ATRIAL... fibrillation (abnormal heart rhythm)