| 释义 |
ˈhalf-tide
1. The state of the tide half-way between flood and ebb, when it is half the height of high water.
1669W. Hacke Collect. Voy. iii. (1699) 61 A Rock that..is covered at half Tide. 1862Ansted Channel Isl. ii. ix. (ed. 2) 240 Innumerable pools of water left at halftide.
2. (See quots.)
1633T. James Voy. 62 It flowes halfe tyde, that is, from whence the flood commeth, the water thither returneth, two houres before it be high water. 1762More in Phil. Trans. LII. 453 The different tides daily observed between Portsmouth and the Isle of Wight, called there tide and half-tide. 1843Penny Cycl. XXVII. 146/1 When the stream continues to flow up for three hours after it is high-water, it is said to make tide and half-tide; if it continues to flow during one hour and a half, it is said to make tide and quarter-tide, and so on.
3. attrib. and Comb. Left dry or accessible at half-tide, as half-tide cavern, half-tide rock; half-tide basin or dock, one fitted with gates which are closed at half-ebb.
1847Craig, Half-tide dock, a basin connecting two or more docks, and communicating with the entrance basin. 1854H. Miller Sch. & Schm. (1858) 532 Half-tide rocks, very dangerous to the mariner, which lie a full half-mile from the shore. 1862Ansted Channel Isl. ii. ix. (ed. 2) 242 It is not every half-tide cavern that is thus inhabited. 1880T. Stevenson in Encycl. Brit. XI. 466/1 In order to extend the time during which vessels can enter or leave a wet dock there are two additional works which are often connected with it. These are the entrance-lock and the outer or half-tide basin.
Hence half-tidal a. = half-tide (attrib.).
1885Truth 11 June 920/2 This difficulty might be met by a half-tidal lock and weir. |