Definition of "leaf"

Earless ghost swift moths become “invisible” to echolocating bats by forming mating clusters close (less than half a meter) above vegetation and effectively blending into the clutter of echoes that the bat receives from the leaves and stems around them.

2013 May-June, William E. Conner, “An Acoustic Arms Race”, in American Scientist, volume 101, number 3, pages 206–7

Heretofore advertisers have had to buy and pay for a leaf — two pages.

1900, Profitable Advertising, volume 10, number 2, page 893

The bridge shear locks were repaired and the long ends of the shear locks shortened about two inches to eliminate butting of the bridge leafs against each other.

1914, Department of Bridges, City of New York, Report, page 90

It will be noted that the pivotal mounting of the cylinders is such that the cylinders have their greatest leverage (i.e., exert the greatest door-opening force) when the door leafs 24, 28 are closed because the cylinders are generally perpendicular to the closed leafs. This is desirable because the load on the leafs is the greatest when they are closed due to air pressure. As the leafs begin to open and this air pressure decreases, the opening force exerted by the cylinders on the door leafs decreases and the opening speed of the leafs increases.

1992 July 21, William R. Kennedy, John M. Kennedy, Power mine door system‎, US Patent 5,222,838

THE NTSB RECOMMENDS THAT THE U.S. COAST GUARD: REQUIRE OWNERS/OPERATORS OF BASCULE BRIDGES TO INSTALL CAUTION LIGHTS AND DAYLIGHT MARKINGS AT ELEVATION POINTS ON BRIDGE LEAFS WHERE THEY PROTRUDE OVER NAVIGABLE CHANNELS TO IDEN TIFY[sic] TO MARINERS THE POINT AT WHICH FULL SKYWARD CHANNEL CLEARANCE IS NOT AVAILABLE TO TRANSITING VESSELS: THE LIGHTS SHOULD ACTIVATE WHEN THE BRIDGELEAFS ARE IN THE NORMAL FULLY OPEN POSITION. […] THE NTSB RECOMMENDS THAT THE U.S. COAST GUARD: REQUIRE THAT BRIDGE OWNERS/OPERATORS PROVIDE IN BASCULE BRIDGE PERMIT APPLICATIONS THE ANGLE OF THE BRIDGELEAF(S). THE MAXIMUM VERTICAL CLEARANCE AT THE FENDERS AND AT THE BRIDGELEAF ENDS, AND THE EXTENT OF HORIZONTAL CHANNEL CLEARANCE OVER WHICH FULL SKYWARD CLEARANCE IS AVAILABLE WHEN THE BRIDGE LEAFS ARE IN THE FULLY OPEN POSITION.

1993, Department of Transportation and Related Agencies Appropriations for 1994: Hearings Before a Subcommittee of the Committee on Appropriations, House of Representatives, One Hundred Third Congress, First Session, Washington, D.C.: U.S. Government Printing Office, page 136

The four separate segments of the movable bridge span, known as bridge leafs, were alternately rehabilitated while maintaining upper-level roadway and pedestrian traffic on one-half of the bridge and waterway traffic on one-half of the river channel.

1993, Realty and Building, page 20

The hydraulic system lifts and rotates two 413-ft (126-m) bridge leafs, each weighing 7,500 tons, in just four minutes.

1993, The Americana Annual: An Encyclopedia of Current Events, Grolier, page 224

Note the Art Deco-style sculptures on the wall of the bridge house showing a ship passing under the raised bridge leafs.

1996, Gerard R. Wolfe, Chicago in and Around the Loop: Walking Tours of Architecture and History, McGraw-Hill, page 150

Like I’ve said, John, you’ve got to get the two bridge leafs to come down very slowly to a complete stop in order to trigger the tongue locks. This is what holds the two leafs of the bridge firmly in place. Otherwise, the bridge leafs will start bouncing, and once they start bouncing, you’ll never stop them from goin’ straight up in the air.

2010, James Newport-Chiakulas, Bridges to Justice: Love, Murder, & Politics in Chicago, iUniverse, page 55

The algorithm pops the stack to obtain a new current node when there are no more children (when it reaches a leaf).

2011, John Mongan, Noah Kindler, Eric Giguère, Programming Interviews Exposed