| two-step exercise test | A test used mainly for coronary insufficiency; significant depression of RS-T in the electrocardiogram is considered abnormal and suggests coronary insufficiency. (05 Mar 2000) |
|---|---|
| two-step procedure | <surgery> When surgical biopsy and breast surgery are performed in two separate surgeries. (09 Oct 1997) |
| unimolecular step | <chemistry> A reaction involving one species (09 Jan 1998) |