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toxicology the science that deals with poisons and the detection and treatment of poisoning.
toxic-shock syndrome a sometimes fatal disease, esp. contracted by young women during menstruation, characterized by fever, vomiting, and diarrhea, and thought to be connected with the use of certain tampons that cause a rapid spread of bacterial infection in the vagina.
toxin any of a group of poisonous substances secreted by microorganisms. [2 definitions]
toxo- variant of toxico-.
toxoid a toxin, used in immunization, that has been rendered nontoxic by chemical or physical means but that retains its capacity to stimulate the production of antibodies.
toy any object, device, or the like that can be used in play, esp. by children; plaything. [7 definitions]
toyon a California evergreen, related to the rose, that bears clusters of white flowers and bright red berries.
toyshop a store in which toys are sold or a workshop in which they are made.
tr. abbreviation of "transitive," in grammar, indicating a verb that takes a direct object, such as "get." [2 definitions]
tra- across; over.
trabeated using horizontal beams or lintels as supports instead of arches. [2 definitions]
trace1 a visible mark or evidence of a past event or of something having been present. [11 definitions]
trace2 one of two ropes, chains, or straps used to harness a draft animal to a cart, carriage, or the like.
trace element a chemical element found in minute quantities in a substance, such as plant or animal tissue or soil.
tracer someone or something that traces. [3 definitions]
tracery an ornamental pattern of branching and interlaced bars or ribs, as in a Gothic window. [2 definitions]
trachea the tube in air-breathing animals that carries air to the lungs; windpipe. [2 definitions]
tracheo- trachea.
tracheotomy the surgical opening of the trachea through the outside of the neck.
trachoma a contagious bacterial eye infection, affecting the conjunctiva and cornea, that is characterized by inflammation, granulation, and eventual scarring.
tracing the act or process of drawing, reproducing, or recording by tracing. [2 definitions]