Nouns starting with B

• Battle of Ravenna — Noun – English ～ a battle between the French and an alliance of Spaniards and Swiss and Venetians in 1512
• beta ray — Noun – English ～ radiation of beta particles during radioactive decay
• butterfly ray — Noun – English ～ a stingray with a short tail and a broad fin
• breeder reactor — Noun – English ～ a nuclear reactor that produces more fissile material than it burns
• beta receptor — Noun – English ～ receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasodilation and increased heart beat)
• beta-adrenergic receptor — Noun – English ～ receptors postulated to exist on nerve cell membranes of the sympathetic nervous system in order to explain the specificity of certain agents that affect only some sympathetic activities (such as vasodilation and increased heart beat)
• brick red — Noun – English ～ a bright reddish-brown color
• beating-reed instrument — Noun – English ～ a musical instrument that sounds by means of a vibrating reed
• bur reed — Noun – English ～ marsh plant having elongated linear leaves and round prickly fruit
• bur-reed family — Noun – English ～ coextensive with the genus Sparganium
• barrier reef — Noun – English ～ a long coral reef near and parallel to the shore
• Babinski reflex — Noun – English ～ extension upward of the toes when the sole of the foot is stroked firmly on the outer side from the heel to the front; normal in infants under the age of two years but a sign of brain or spinal cord injury in older persons
• birth-control reformer — Noun – English ～ a social reformer who advocates birth control and family planning
• board of regents — Noun – English ～ a committee of university officers who have general supervision over the welfare and conduct of students
• biogeographical region — Noun – English ～ an area of the Earth determined by distribution of flora and fauna
• Bluegrass Region — Noun – English ～ an area in central Kentucky noted for its bluegrass and thoroughbred horses
• bog rein orchid — Noun – English ～ orchid with spikes of many fragrant white flowers on erect leafy stems; of wet or boggy ground through most of the West and northern North America
• bearing rein — Noun – English ～ a rein designed to keep the horse's head in the desired position
• bank-depositor relation — Noun – English ～ the responsibility of a bank to act in the best interests of the depositors
• blood relation — Noun – English ～ one related by blood or origin; especially on sharing an ancestor with another

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