from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. To merge into each other in a series of stages, forms, or types.
- n. A transitional stage, form, or type.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To pass or change from one state to another by steps or stages.
from The Century Dictionary and Cyclopedia
- To become alike gradually, or approach in character by degrees, as one animal or plant compared with another; be graduated with diminishing degrees of difference, or graded into one another, as two or more species. See the extract.
- n. An intermediate grade.
Sorry, no etymologies found.
My favorite falcon in the world, the Altai, is probably a natural hybrid or, if you merge the species, "intergrade" of the Gyr and Saker.
Perhaps Darwin's most important insight was his realization that species are not immutable, that they can intergrade over time in an "insensible series."
From The Evolution List via Telic Thoughts Perhaps Darwin's most important insight was his realization that species are not immutable, that they can intergrade over time in an "insensible series."
They make no effort to intergrade with the whites but they quite willing for us to support them totally.
On drier, high elevation slopes and ridgetops, both pitch pine-scrub oak and chestnut oak forests occur, and often intergrade.
Southern Rocky Mountain fauna species intergrade with Great Plains species on Black Mesa in the western Panhandle.
These coastal savannas intergrade with low coastal forest and scrub, which gradually give way to continuous moist forest cover further inland.
Lowland rain forests of the drier, semi-evergreen type typical of the periphery of the Congo basin, intergrade with secondary grassland and wooded grassland, that in turn form the basis of the higher latitude Sudanian province.
Forest, woodland and secondary grassland intergrade in patterns controlled by annual precipitation, duration of water stress and the severity of dry-season fires and human activity.
There are well-documented examples of species that intergrade into each other even if “my eyes plus public opinion plus the written testimony of thousands of competent investigators constantly say otherwise”.