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downdip, adj. and adv.

Frequency (in current use): 
Origin: Formed within English, by compounding. Etymons: down prep., dip n.1
 A. adj.

  Situated or occurring in a direction downwards along the dip of a stratum, surface, etc.

1904   Geogr. Teacher 2 249   The strike streams have the up-dip slope gentler and higher, the down-dip slope lower and steeper.
1916   F. H. Lahee Field Geol. viii. 191   When a fault is approximately parallel to the strike of the strata, the block on the side of the fault toward which the dip of the beds is measured may be termed the down-dip block, and the other one is the up-dip block.
1984   J. J. Lowe & M. J. C. Walker Reconstructing Quaternary Environments iii. 101   Where the dip of the pebbles has been recorded, orientation measurements are taken in the down-dip direction.
2004   I. Lerche & S. Noeth Econ. Petroleum Production II. 23   A conventional stratigraphic trap has a distinct downdip water level.

1904—2004(Hide quotations)

 B. adv.

  In a direction downwards along the dip of a stratum, surface, etc.

1923   Jrnl. Geol. (Chicago) 31 78   The Ivahy..for a portion of its course flows at the eastern foot of the lava escarpment, shifting its channel down dip in accordance with Gilbert's Law.
1972   R. G. Kazmann Mod. Hydrol. (ed. 2) v. 175   The aquifer may pinch out in clay downdip.
2010   Geology 38 999/1   The fluid that cemented the concretions moved downdip, away from the bleached sandstone on the structural high.

1923—2010(Hide quotations)


This entry has been updated (OED Third Edition, December 2018).