Question: what spanish verb does the eastern waterfront and roadway of the Port of San Francisco which  Market Street begin at derived from

Context paragraphs:
Market Street (San Francisco): Market Street is a major thoroughfare in San Francisco, California.  It begins at The Embarcadero in front of the Ferry Building at the northeastern edge of the city and runs southwest through downtown, passing the Civic Center and the Castro District, to the intersection with Corbett Avenue in the Twin Peaks neighborhood.  Beyond this point, the roadway continues as Portola Drive into the southwestern quadrant of San Francisco.  Portola Drive extends south to the intersection of St. Francis Boulevard and Sloat Boulevard, where it continues as Junipero Serra Boulevard.

Phelan Building: The Phelan Building is an 11-story office building located at 760 Market Street in the Financial District of San Francisco, California.  It has a triangular shape reminiscent of the Flatiron Building in Manhattan, New York City, with its tip at the meeting point of Market Street, O’Farrell Street, and Grant Avenue.  It is a San Francisco Designated Landmark.

Port of San Francisco: The Port of San Francisco is a semi-independent organization that oversees the port facilities at San Francisco, California, United States.  It is run by a five-member commission, appointed by the Mayor and approved by the Board of Supervisors.  The Port is responsible for managing the larger waterfront area that extends from the anchorage of the Golden Gate Bridge, along the Marina district, all the way around the north and east shores of the city of San Francisco including Fisherman's Wharf and the Embarcadero, and southward to the city line just beyond Candlestick Point.  In 1968 the State of California, via the California State Lands Commission for the State-operated San Francisco Port Authority (est. 1957), transferred its responsibilities for the Harbor of San Francisco waterfront to the City and County of San Francisco / San Francisco Harbor Commission through the Burton Act AB2649.  All eligible State port authority employees had the option to become employees of the City and County of San Francisco to maintain consistent operation of the Port of San Francisco.

Powell Street station: Powell Street is a shared Muni Metro and Bay Area Rapid Transit station near the intersection of Market Street and Powell Street in downtown San Francisco.  The station is located along the Market Street Subway and extends underground from Fourth Street to Fifth Street.  Hallidie Plaza connects to the station on the north side of Market Street.  Like all of the shared BART and Muni stations on the Market Street Subway, the concourse mezzanine is on the first level down, an island platform for the Muni Metro is on the second level down, and the island platform for BART is on the third level down.  The Powell-Mason and Powell-Hyde cable car lines turn around at Powell and Market, above the station.

Montgomery Street station: Montgomery Street is a shared Muni Metro and Bay Area Rapid Transit subway station in the Financial District of San Francisco, California.  It is located on the Market Street Subway beneath Market Street, between Montgomery Street and Sansome Street.  Like all of the shared BART and Muni stations on the Market Street Subway, the concourse mezzanine is on the first level down, an island platform for the Muni Metro is on the second level down, and the island platform for BART is on the third level down.

Market Street Subway: The Market Street Subway is a double-decker subway tunnel that carries Muni Metro and BART train traffic in San Francisco, California.  It runs under the length of Market Street between Embarcadero Station and Castro Street Station.  The upper level is used by Muni Metro lines and the lower level is used by BART lines.  BART does not run through the whole subway; it turns south and runs under Mission Street southwest of Civic Center Station.  The northeastern end of the BART level is connected to the Transbay Tube.  On the Muni Metro level, the southwestern end of the Market Street Subway connects to the much-older Twin Peaks Tunnel, and the northeastern end connects to surface tracks along the Embarcadero.

Thomas Hayes (San Francisco landowner): Thomas Hayes (1820 – June 23, 1868) was a land owner in the western addition to San Francisco in the 19th century.  Hayes Valley in the western addition and Hayes Street are named after him.  He was the original franchisee of the Market Street Railway and county clerk between 1853 and 1856.  The franchise for what would become the Market Street Railway was granted in 1857.  The line was the first horsecar line to open in San Francisco, opened on July 4, 1860, as the Market Street Railroad Company.  The goal was to bring the land to market.  The method would be a railway.  Thomas Hayes, who owned a large tract in the Western Addition, now known as the "Hayes Valley" and the banking house of Pioche and Bayerque, who held Hayes's mortgage, ultimately joined with several large property owners in the Mission, to form a business alliance to build a rail line connecting the main part of San Francisco with the old Mission settlement, a distance of three miles.

Market Street Railway (transit operator): The Market Street Railway Company was a commercial streetcar and bus operator in San Francisco.  The company was named after the famous Market Street of that city, which formed the core of its transportation network.  Over the years, the company was also known as the Market Street Railroad Company, the Market Street Cable Railway Company and the United Railroads of San Francisco.

A Trip Down Market Street: A Trip Down Market Street is a 13-minute actuality film recorded by placing a movie camera on the front of a cable car as it traveled down San Francisco’s Market Street.  A virtual time capsule from over 100 years ago, the film shows many details of daily life in a major American city, including the transportation, fashions and architecture of the era.  The film begins at 8th Street and continues eastward to the cable car turntable, at The Embarcadero, in front of the San Francisco Ferry Building.  It was produced by the four Miles brothers: Harry, Herbert, Earle and Joe.  Harry J. Miles cranked the Bell & Howell camera during the filming.  The film is notable for capturing San Francisco shortly before the city's devastating earthquake and fire, which started on the morning of Thursday, April 18, 1906.

Embarcadero (San Francisco): The Embarcadero is the eastern waterfront and roadway of the Port of San Francisco, San Francisco, California, along San Francisco Bay.  It was constructed on reclaimed land along a three mile long engineered seawall, from which piers extend into the bay.  It derives its name from the Spanish verb "embarcar", meaning "to embark"; "embarcadero" itself means "the place to embark".  The Central Embarcadero Piers Historic District was added to the National Register of Historic Places on November 20, 2002.

Supporting paragraphs: Market Street (San Francisco) Embarcadero (San Francisco)
Answer: "embarcar"