planateadj.
/ˈpleɪneɪt/, U.S. /ˈpleɪˌneɪt/ 1. Chiefly Entomology and Botany. Flattened, occurring in or forming a flat plane, planar.
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1890 Cent. Dict. Planate, in entom., flat; forming a plane; flattened.
1952 Amer. Midland Naturalist 48 346 Pronotum planate, neither tumid nor transversely depressed.
1971 Amer. Jrnl. Bot. 58 417/2 The pinnules of Gleichenia linearis are slender, nearly linear, planate structures.
1979 Amer. Jrnl. Bot. 66 124 Planate growth was initiated within 12–18 days following germination by a division, usually oblique, in the long axis of the filament.
1997 Internat. Jrnl. Plant Sci. 158 350/2 In this group the plants were thought to have ultimate branching units arranged suboppositely on a small central axis to give a planate ‘frond’.
2. Geomorphology. = planated adj. 1.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > erosion or weathering > [adjective] > erosion of specific features
overdeepened1900
planated1911
planate1952
karstified1968
1952 Ann. Assoc. Amer. Geographers 42 295 Planate bedrock surfaces, rock pediments and rock benches, form a large proportion of the comparatively flat relief elements of arid and semiarid landscapes.
1964 Trans. & Papers (Inst. Brit. Geographers) No. 34. 109 Where an extensive planate surface remains, gnammas form mainly through the disintegrating effects of water.
1972 Geogr. Rev. 62 70 (caption) Schematic representation of the development and abandonment of unpaired gibber-protected planate surfaces during slow stream incision.
This is a new entry (OED Third Edition, June 2006; most recently modified version published online March 2022).
planatev.
/pləˈneɪt/, U.S. /ˈpleɪˌneɪt/ Geomorphology.
transitive. To make level by erosion. Chiefly in passive.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > erosion or weathering > erode [verb (transitive)] > erosion of specific features
peneplain1896
overdeepen1905
planate1906
lateritize1909
karstify1972
1906 Geogr. Jrnl. 28 628 Mr. Spencer has already contended that the Pacific Mountain system and the Yukon plateau were planated at the same period, either late Eocene or Miocene.
1950 A. W. Currie in G. W. Brown Canada viii. 184 The Shield itself is composed of very old crystalline rocks planated by centuries of erosion and then heavily glaciated in the Pleistocene period.
1978 Ann. Assoc. Amer. Geographers 68 111/2 Only within this zone is storm wave attack sufficient to planate steeply dipping, resistant strata.
2000 Business Wire (Nexis) 17 Mar. This area has been planated over millions of years by the Vaal river which has steadily migrated eastwards.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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adj.1890v.1906