from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Botany Flattened and having distinct upper and lower surfaces, as most leaves do.
- adj. Biology Extending from a dorsal to a ventral surface: dorsiventral muscles.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. dorsoventral
from the GNU version of the Collaborative International Dictionary of English
- adj. Having distinct upper and lower surfaces, as most common leaves. The leaves of the iris are not dorsiventral.
- adj. See Dorsoventral.
from The Century Dictionary and Cyclopedia
- In anatomy, same as dorsabdominal.
- In botany, same as bifacial, 2.
- Also dorsoventral.
Sorry, no etymologies found.
With hardly an exception the liverworts are dorsiventral, and usually one side is turned to the substratum and the other exposed to the light.
The dorsiventral thallus is constructed on the same plan throughout the group, and shows a lower region composed of cells containing little chlorophyll and an upper stratum specialized for assimilation and transpiration.
In these cases the shoot system is often more or less dorsiventral, and the sexual organs are borne on short lateral branches (e.g. _Thuidium tamariscinum_).
Advance has been along two lines, markedly in relation to insect-pollination, one of which has culminated in the hypogynous epipetalous bicarpellate forms with dorsiventral often large and loosely arranged flowers such as occur in Scrophulariaceae, and the other in the epigynous bicarpellate small-flowered families of which the Compositae represent the most elaborate type.
Monocotyledons a similar advance from hypogyny to epigyny is observed, and from the dorsiventral to the radial type of flower.
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