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acquired characteristic a change in the structure or function of a living organism that is caused by environmental factors and may not be transmitted genetically.
add-on an optional item that may be bought in addition to a main item to supplement or improve it. [1/2 definitions]
adenosine an organic compound that is made up of adenine and ribose and found in nucleic acids, and that may be obtained as a white crystalline powder through the hydrolysis of yeast.
ad libitum at one's pleasure (used as a musical direction to indicate that a section so marked may be varied, improvised upon, or omitted, as the performer wishes, or as a stage direction to indicate that the performer may improvise).
AIDS-related complex a condition characterized by enlargement of the lymph nodes that may be an early sign of AIDS.
air letter a sheet of very lightweight paper that may be folded into an envelope for mailing abroad; aerogramme. [1/2 definitions]
allotrope one of several forms in which a chemical element may exist.
amen thus it is; may it be so (used at the end of a prayer or statement to express agreement or approval). [1/3 definitions]
American dream the American ideal that any man or woman may obtain material wealth, equality, freedom, and the like.
arbovirus any of a number of viruses that are transmitted by certain blood-sucking arthropods such as mosquitoes and ticks and that may cause encephalitis, yellow fever, or dengue fever.
at ease in the military, a standing position in which soldiers may relax but not leave formation or talk. [1/2 definitions]
bacterium any of a large group of one-celled microscopic organisms of various shapes that are often agents of fermentation and putrefaction and that may cause disease.
balloon a bag made of rubber or other light, strong material that may be filled with air or helium and used as a decoration or toy. [1/8 definitions]
belay in mountain climbing, a secure projection such as a rock, tree, or the like, around which a rope may be run or fastened. [1/6 definitions]
bicycle pump a small pump used to inflate bicycle tires, esp. a hand-held pump that may be attached to a bicycle frame when not in use.
blog shortened from "Web log," an online journal that may be personal or topical, in which the author makes regular entries that appear in reverse chronological order and can be read by the general public. [1/2 definitions]
blowgun a hollow tube through which missiles such as darts, pellets, or arrows may be projected by blowing.
breadboard a board on which experimental designs for an electrical circuit may be laid out. [1/2 definitions]
bumper sticker a usu. rectangular piece of laminated paper printed with a slogan, aphorism, advertisement, or the like that may be stuck to the bumper of an automobile.
button any of various small, usually round, fasteners which are attached to a garment and designed to slide through a slit or loop. They may also be used purely for decoration. [1/7 definitions]
call girl a female prostitute who may be hired by telephone.