• Webster's Revised Unabridged Dictionary
    • n Redtop (Bot) A kind of grass (Agrostis vulgaris) highly valued in the United States for pasturage and hay for cattle; -- called also English grass, and in some localities herd's grass. See Illustration in Appendix. The tall redtop is Triodia seslerioides.
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Century Dictionary and Cyclopedia
    • n redtop A kind of bent-grass, Agrostis vulgaris (A. alba, var. vulgaris). The species is common throughout the northern parts of the Old World, and is thoroughly naturalized in America. It is marked to the eye by its large light panicle of minute spikelets on delicate branches, which is of a reddish hue. Other varieties, called fiorin, white bent, etc., have a whitish top and a longer ligule. Redtop, at least in the United States, is a highly valued pasture-grass, and is also sown for hay. It forms a fine turf, and is suitable for lawns. Also called fine bent, finetop-grass, and herd's-grass.
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In literature:

Redtop worked fast and easily, and after some time held up a beautiful ax.
"The Cave Boy of the Age of Stone" by Margaret A. McIntyre
Some other grasses may also be added under certain conditions, or substituted for timothy or redtop.
"Clovers and How to Grow Them" by Thomas Shaw
In New England, timothy, red clover, and redtop are generally used for the mowing crop.
"Agriculture for Beginners" by Charles William Burkett
REDTOP is a grass familiar to every farmer in the country.
"Cattle and Their Diseases" by Robert Jennings
Soils that produce sorrel and redtop when red clover and timothy are sown need drainage or liming or both.
"The Young Farmer: Some Things He Should Know" by Thomas Forsyth Hunt
PLATE V. Ergot in hay: 1, bluegrass; 2, timothy; 3, wild rye; 4, redtop.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
Redtop, clover, and timothy grow rank, and are profitably cultivated.
"Fifty Years In The Northwest" by William Henry Carman Folsom