what is a plinth table
[plinth] 1  1. a padded table for a patient to sit on or lie on while performing exercises, receiving a massage, or undergoing other physical therapy treatments. 2  2. a waterproof table used in a hydrotherapy tub to facilitate exercise and movement in the water. plinth. A table, seat, or apparatus on which a patient lies or sits while doing remedial exercise or undergoing examination.