a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan
heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
derived from experiment and observation rather than theory; "an empirical basis for an ethical theory"; "empirical laws"; "empirical data"; "an empirical treatment of a disease about which little is known"
a methodical examination or review of a condition or situation; "he made an audit of all the plants on his property"; "an energy efficiency audit"; "an email log audit"
attend academic courses without getting credit
examine carefully for accuracy with the intent of verification; "audit accounts and tax returns"
a part of the cell containing DNA and RNA and responsible for growth and reproduction
any histologically identifiable mass of neural cell bodies in the brain or spinal cord
the positively charged dense center of an atom
(astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
the act of subjecting to experimental test in order to determine how well something works; "they agreed to end the testing of atomic weapons"
an examination of the characteristics of something; "there are laboratories for commercial testing"; "it involved testing thousands of children for smallpox"
(law) legal proceedings consisting of the judicial examination of issues by a competent tribunal; "most of these complaints are settled before they go to trial"
(law) the determination of a person's innocence or guilt by due process of law; "he had a fair trial and the jury found him guilty"
trying something to find out about it; "a sample for ten days free trial"; "a trial of progesterone failed to relieve the pain"
an annoying or frustrating or catastrophic event; "his mother-in-law's visits were a great trial for him"; "life is full of tribulations"; "a visitation of the plague"
(sports) a preliminary competition to determine qualifications; "the trials for the semifinals began yesterday"