Hydrangeaceae is a botanical family of flowering plants which include hydrangeas, deutzias and philadelphus. If you're looking for a synonym for this word, you could describe it as a family of shrubs that produce showy flowers in the summer. Alternatively, you might use the term "hydrangea family" as a simpler way of referring to this group of plants. Another option is to use the scientific name of a specific genus within the family such as Deutzia or Philadelphus. Regardless of the term used, Hydrangeaceae includes a variety of beautiful flowering shrubs that can add a splash of color to any garden or landscape.