Words starting with A that are validated

• automobile race — Noun – English ～ a race between (usually high-performance) automobiles
• Aralia racemosa — Noun – English ～ unarmed woody rhizomatous perennial plant distinguished from wild sarsaparilla by more aromatic roots and panicled umbels; southeastern North America to Mexico
• Aristotelia racemosa — Noun – English ～ graceful deciduous shrub or small tree having attractive foliage and small red berries that turn black at maturity and are used for making wine
• auto racing — Noun – English ～ the sport of racing automobiles
• anti-racketeering law — Noun – English ～ law intended to eradicate organized crime by establishing strong sanctions and forfeiture provisions
• Al-Radi — Last name – Danish
• Abou-Radi — Last name – Danish
• arteria radialis — Noun – English ～ branch of the brachial artery beginning below the elbow and extending down the forearm around the wrist and into the palm
• alpha radiation — Noun – English ～ the radiation of alpha particles during radioactive decay
• adaptive radiation — Noun – English ～ the development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches
• acoustic radiation pressure — Noun – English ～ (acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound wave
• actinic radiation — Noun – English ～ electromagnetic radiation that can produce photochemical reactions
• alkyl radical — Noun – English ～ any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
• aldehyde radical — Noun – English ～ the chemical group -CHO
• alcohol radical — Noun – English ～ the chemical group -OH
• allyl radical — Noun – English ～ the univalent unsaturated organic radical C3H5; derived from propylene
• azido radical — Noun – English ～ the univalent group N3- derived from hydrazoic acid
• azo radical — Noun – English ～ the bivalent group -N=N- united to two hydrocarbon groups
• acetyl radical — Noun – English ～ the organic group of acetic acid (CH3CO-)
• Aeschynanthus radicans — Noun – English ～ epiphyte or creeping on rocks; Malaysian plant having somewhat fleshy leaves and bright red flowers

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