| Toronto formula | For pulmonary artery banding, a technique that provides a general guide for the size of the band relative to the patient's weight. (05 Mar 2000) |
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| calyx | The sepals of one flower collectively. (09 Oct 1997) |
| calyx-tube | A tube formed by fusion or cohesion of sepals. Compare: hypanthium. (09 Oct 1997) |