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Longman Dictionary of Contemporary English
landscape architect
noun
EXAMPLES FROM CORPUS
▪ Finally in 1974 the San Francisco landscape architect Lawrence Halprin won the commission.
▪ He achieved great success and became the leading landscape architect of the day.
▪ On this occasion Andy, the landscape architect, whom her father nicknamed Adam the gardener, was invited.
▪ Santee recently hired a landscape architect to begin drawing designs for a skate park.
▪ The book by Folkwin Wendland, a trained garden- and landscape architect, traces its history since 1450.
WordNet
landscape architect

n. someone who arranges features of the landscape or garden attractively [syn: landscape gardener, landscaper, landscapist]

Wikipedia
Landscape architect

A landscape architect is a person who is educated in the field of landscape architecture. The practice of landscape architcture includes: site analysis, site inventory, land planning, planting design, grading, storm water management, sustainable design, construction specification and insuring that all plans meet the current building codes and local and federal ordinances. The title landscape architect was first used by Frederick Law Olmsted, the designer of New York City's Central Park.

Usage examples of "landscape architect".

The landscape architect built it already ruined, artificially ancient.

Thus, a landscape architect I know savors the very smell of the dirt embedded in his botany texts.

The unofficial mayor was Nils Fishback, former landscape architect of an ambitious project that had promised three high-rise beachfront condominiums, a total of 660 units, called the Towers of Tarpon Island.

Ought to have a landscape architect work out a plan for it, of course--although, if he bought some landscaping books and spent some evenings at them, he might be able to figure things out for himself.