POSITIVENESS
\pˈɒzɪtˌɪvnəs], \pˈɒzɪtˌɪvnəs], \p_ˈɒ_z_ɪ_t_ˌɪ_v_n_ə_s]\
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n. Reality of existence ; actualness ;-undoubting assurance ; peremptoriness.
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beta Lactams
- Cyclic amides formed aminocarboxy acids by the elimination water. They isomeric with lactims, which are enol forms of lactams. (From Dorland, 27th ed)