| 释义 |
headward, adv. and a.|ˈhɛdwəd|
Also 9 -wards.
[f. head n.1 + -ward.]
†A. orig. in phrase.
a. to the headward, toward the head, in the direction of the head.
b. Of a ship: In advance, ahead. Obs.
1387Trevisa Higden (Rolls) III. 323 A briȝt swerd..and þe poynt dounward evene to his hevedward. 1662Hobbes 7 Problems vi. Wks. 1845 VII. 44 The ship will gain the space DF to the headward. 1674N. Fairfax Bulk & Selv. 130 Why earthworms are limed so much to the headward.
B. adv. Towards or in the direction of the head.
1798H. Tooke Purley (1829) I. ix. 423 Where you may use indifferently either Upward, Topward, or Headward. 1862M. B. Edwards John & I xxix. (1876) 221, I was thrown headwards from my seat. 1883A. Maclean in Memorial Vol. 295 They are robust enough headward.
C. adj. Being in the region or direction of the head. headward erosion: erosion of a stream at its head, in such a way that the length of the stream is increased.
1667T. Coxe in Phil. Trans. II. 452 The heart-ward part of the Vein..and the head-ward part of it. 1894Nation (N.Y.) 13 Sept. 195/1 Headward growth of branches. 1916H. F. Cleland Geol. iv. 99 A valley is lengthened at its upper end and is cut back by the water which flows in at its head... This is called headward erosion. 1922C. A. Cotton Geomorphol. N.Z. i. 72 They [sc. insequent streams] rapidly eat their way back into the interfluves by headward erosion. 1937Wooldridge & Morgan Physical Basis Geogr. xii. 162 With the progress of time it [sc. down-cutting] proceeds backwards, i.e. headwards, from the lowest point. The grading of a stream course thus involves headward erosion. 1944A. Holmes Princ. Physical Geol. ii. x. 153 The torrent tract..evolves into the valley tract, and each gradually migrates inland as the source continues to recede by headward erosion. 1965F. J. Monkhouse Dict. Geogr. 154/2 Headward erosion, the cutting back upstream of a valley above its original source by rainwash, gullying and spring-sapping. 1968[see dissection 7]. |