- present tense form of define (3rd person singular).
defines
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
To break it down," said Calhoun bitterly, "I need aromatic olefines and some acetone, and acetic-acid radicals and methyl submolecular groups.
From The Hate Disease by Leinster, Murray
They belong mostly to the paraffins CnH2n+2, and the olefines CnH2n.
From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" by Various
The temperature must be above 18�; and the absorption is prevented by ammonia, olefines, alcohol, and some other substances.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" by Various
Others of the olefines are present in minute quantities.
From The Story of a Piece of Coal What It Is, Whence It Comes, and Whither It Goes by Martin, Edward A.