"Partial bath" is not a commonly used term in real estate. Every form I have ever used as a Realtor and an appraiser does differentiate between "Full Bath", "3/4 bath", and "1/2 bath". Full bath has at least three fixtures being tub, sink, and toilet. Three quarter (3/4) has a shower, toilet and sink. Lastly, 1/2 bath has a sink and toilet. Over the years I have seen properties which have had an additional sink OR toilet either in a bedroom or somewhere else in the home. That could be referred to as "partial bath" but is felt to have limited utility and therefore inconsequential value to the property.