Nouns starting with A

• arrowleaf groundsel — Noun – English ～ perennial with sharply toothed triangular leaves on leafy stems bearing a cluster of yellow flower heads; moist places in mountains of western North America
• alkyl group — Noun – English ～ any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
• age group — Noun – English ～ a group of people having approximately the same age
• air group — Noun – English ～ a unit of the United States Air Force larger than a squadron and smaller than a wing
• alcohol group — Noun – English ～ the chemical group -OH
• aldehyde group — Noun – English ～ the chemical group -CHO
• amino group — Noun – English ～ the radical -NH2
• amphibole group — Noun – English ～ a group of minerals with similar crystal structures containing a silicate chain and combinations of chiefly sodium and calcium and magnesium and iron and aluminum
• allyl group — Noun – English ～ the univalent unsaturated organic radical C3H5; derived from propylene
• animal group — Noun – English ～ a group of animals
• arsenic group — Noun – English ～ the univalent group derived from arsine
• azo group — Noun – English ～ the bivalent group -N=N- united to two hydrocarbon groups
• azido group — Noun – English ～ the univalent group N3- derived from hydrazoic acid
• acyl group — Noun – English ～ any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"
• Adapid group — Noun – English ～ extinct small mostly diurnal lower primates that fed on leaves and fruit; abundant in North America and Europe 30 to 50 million years ago; their descendents probably include the lemurs; some authorities consider them ancestral to anthropoids but others consider them only cousins
• acetyl group — Noun – English ～ the organic group of acetic acid (CH3CO-)
• advocacy group — Noun – English ～ an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying
• ABO group — Noun – English ～ a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O
• Abelian group — Noun – English ～ a group that satisfies the commutative law
• Asian black grouse — Noun – English ～ a black grouse of western Asia

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