| BRACHISTOCHRONE | • brachistochrone n. (Mathematics) A cycloid; the curve of fastest descent between two points. • BRACHISTOCHRONE n. the curve along which a particle acted on by a force (e.g. gravity) will pass in the shortest time from one given point to another. |
| BRACHYTHERAPIES | • brachytherapies n. Plural of brachytherapy. • BRACHYTHERAPY n. a medical procedure used in the treatment of prostate cancer. |
| BREAKTHROUGHS | • breakthroughs n. Plural of breakthrough. • BREAKTHROUGH n. an offensive thrust that penetrates and carries beyond a defensive line in warfare. |
| BROTHERHOODS | • brotherhoods n. Plural of brotherhood. • BROTHERHOOD n. the state of being brothers. |
| ERYTHROPHOBIAS | • ERYTHROPHOBIA n. an aversion to the color red; an extreme fear of blushing. |
| HAIRBREADTHS | • hairbreadths n. Plural of hairbreadth. • HAIRBREADTH n. the breadth of a hair; a minute distance, also HAIRSBREADTH. |
| HAIRSBREADTH | • hairsbreadth n. A very short distance or a very small amount (as is the width of a hair). • hair's␣breadth n. A very small amount or distance. • HAIRSBREADTH n. the breadth of a hair; a minute distance, also HAIRBREADTH. |
| HAIRSBREADTHS | • hairsbreadths n. Plural of hairsbreadth. • hairs'␣breadths n. Plural of hair’s breadth. • HAIRSBREADTH n. the breadth of a hair; a minute distance, also HAIRBREADTH. |
| HEARTTHROBS | • heartthrobs n. Plural of heartthrob. • HEARTTHROB n. an object of affection. |
| HEATHBERRIES | • HEATHBERRY n. any of various plants that have berrylike fruits and grow on heaths, such as the bilberry and crowberry. |
| MOUTHBREATHERS | • mouthbreathers n. Plural of mouthbreather. • mouth-breathers n. Plural of mouth-breather an alternative spelling of mouth breather. • mouth␣breathers n. Plural of mouth breather. |
| THOROUGHBRACES | • thoroughbraces n. Plural of thoroughbrace. • THOROUGHBRACE n. any of several leather straps supporting the body of a carriage and serving as springs. |
| THOROUGHBREDS | • thoroughbreds n. Plural of thoroughbred. • Thoroughbreds n. Plural of Thoroughbred. • THOROUGHBRED n. a horse so bred. |