acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction; "of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced"
a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
a proposal intended to explain certain facts or observations
primary social group; parents and children; "he wanted to have a good job before starting a family"
people descended from a common ancestor; "his family has lived in Massachusetts since the Mayflower"
a social unit living together; "he moved his family to Virginia"; "It was a good Christian household"; "I waited until the whole house was asleep"; "the teacher asked how many people made up his home"
(biology) a taxonomic group containing one or more genera; "sharks belong to the fish family"
an association of people who share common beliefs or activities; "the message was addressed not just to employees but to every member of the company family"; "the church welcomed new members into its fellowship"
act of getting or draining something such as electricity or a liquid from a source; "the drawing of water from the well"
the creation of artistic pictures or diagrams; "he learned drawing from his father"
a representation of forms or objects on a surface by means of lines; "drawings of abstract forms"; "he did complicated pen-and-ink drawings like medieval miniatures"
an illustration that is drawn by hand and published in a book or magazine; "it is shown by the drawing in Fig. 7"