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 for Lag of the tide
From The Collaborative International Dictionary of English v.0.48 :

  Lag \Lag\, n.
     1. One who lags; that which comes in last. [Obs.] "The lag of
        all the flock." --Pope.
        [1913 Webster]
     2. The fag-end; the rump; hence, the lowest class.
        [1913 Webster]
              The common lag of people.             --Shak.
        [1913 Webster]
     3. The amount of retardation of anything, as of a valve in a
        steam engine, in opening or closing.
        [1913 Webster]
     4. A stave of a cask, drum, etc.; especially: (Mach.), one of
        the narrow boards or staves forming the covering of a
        cylindrical object, as a boiler, or the cylinder of a
        carding machine or a steam engine.
        [1913 Webster]
     5. (Zool.) See Graylag.
        [1913 Webster]
     6. The failing behind or retardation of one phenomenon with
        respect to another to which it is closely related; as, the
        lag of magnetization compared with the magnetizing force
        (hysteresis); the lag of the current in an alternating
        circuit behind the impressed electro-motive force which
        produced it.
        [Webster 1913 Suppl.]
     Lag of the tide, the interval by which the time of high
        water falls behind the mean time, in the first and third
        quarters of the moon; -- opposed to priming of the tide,
        or the acceleration of the time of high water, in the
        second and fourth quarters; depending on the relative
        positions of the sun and moon.
     Lag screw, an iron bolt with a square head, a sharp-edged
        thread, and a sharp point, adapted for screwing into wood;
        a screw for fastening lags.
        [1913 Webster]

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