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aspen any of several poplar trees whose leaves flutter in the slightest breeze.
Asperger's syndrome a mild autism spectrum disorder in which afflicted individuals are generally of normal intelligence but have poor social and nonverbal communication skills.
Aspergillus a genus of fungus that is classified as a mold.
asperity harshness or roughness, esp. of tone or manner.
asperse to spread false accusations or malicious insinuations against; slander.
aspersion an insulting or malicious remark about someone; derogation; slander. [2 definitions]
asphalt a sticky brown to black bituminous substance, occurring naturally or obtained as a by-product of refining petroleum and coal tar, and used for paving, roofing, and waterproofing. [4 definitions]
asphalt jungle any large city, esp. when considered as the noisy, crowded arena of a struggle for survival.
asphaltum see asphalt.
asphodel any of several flowering plants related to lilies, with tall spikes bearing clusters of usu. yellow or white flowers.
asphyxia a lack of oxygen or excess of carbon dioxide in the lungs that results in suffocation.
asphyxiate to cause unconsciousness or death by cutting off oxygen to; suffocate. [2 definitions]
aspic1 a gelatin, usu. of meat or fish stock, used as a garnish for fish or meat or to make a mold of various foods.
aspic2 a lavender plant of which the oil is used in making perfumes.
aspidistra a plant with broad, smooth evergreen leaves growing from the base of the stem, often cultivated as a houseplant.
aspirant a person who aspires, esp. to a certain position, rank, or the like. [2 definitions]
aspirate in phonetics, to pronounce (a speech sound) with an audible release or rush of air, as the "h" in "helium" or the "p" in "pickle". [5 definitions]
aspiration ambition, goal, or aim. [2 definitions]
aspirator a device that removes gas or fluids by suction, esp. one used to evacuate a body cavity.
aspire to want strongly; have as an aim (usu. fol. by "to" "after," or an infinitive).
aspirin a drug used to relieve pain and reduce symptoms of fever or inflammation. [2 definitions]