the GNU version of the Collaborative International Dictionary of English
adj. Of or pertaining to the ornamental cutting and trimming of trees, hedges, etc.; practicing ornamental gardening.
The Century Dictionary and Cyclopedia
Of, pertaining to, or practising topiary work.
Word Usage
"Goats are over-plentiful here, and the hollies, oaks and thorns along the path have been gnawed by them into quaint patterns like the topiarian work in old-fashioned gardens."