Black cohosh is an herb that comes from the root or underground stems of a tall plant in the buttercup family.

VOA: special.2009.05.19

For his mathematical project, he compared two ways to estimate the square root of an integer, a number with no fractional parts.

VOA: special.2011.03.24

The bottom of the root ball will look something like the spread-open wings of a butterfly.

VOA: special.2011.04.19

At the base of the hair root is a small ball-like formation called a bulb.

VOA: special.2011.04.05

"It's so simple. With a two-liter bottle you add sugar, you add extract, you add a small amount of yeast and water, cap it up and in two days they've got root beer.

VOA: special.2011.08.01

After a bullish start this year, a wave of pessimism appears to be taking root.

VOA: standard.2010.05.25

"The recommendations are very clear." "For a country like Greece, you need to act on the fiscal side, and therefore addressing very forcefully the root causes of your fiscal problems through spending cuts and increasing taxation."

VOA: standard.2010.03.11

Smith says American academicians and journalists often cite a list of root causes for Middle East turmoil, in which the U.S., the West and Israel usually play a big part: a history of colonialism and economic exploitation, the creation of Israel and American support for the Jewish state, the politics of oil, Western backing of repressive Arab regimes and the U.S.military presence in the region.

VOA: standard.2010.03.18