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carboxy terminus
carboxy terminus n. 
/kɑːˈbɒksɪ ˌtəːmᵻnəs/, /kɑrˈbɑksi ˌtərmənəs/ the free carboxyl group at one end of a peptide chain; the end of a peptide chain that terminates in a free carboxyl group, rather than in an amino group; contrasted with amino terminus n. at amino- comb. form Additions.
Brit. /kɑːˌbɒksɪ ˈtəːmᵻnəs/
, /kɑːˌbɒksɪ ˈtəːmᵻnəs//kɑːˈbɒksɪ ˌtəːmᵻnəs/U.S. /kɑrˌbɑksi ˈtərmənəs/
, /kɑrˌbɑksi ˈtərmənəs//kɑrˈbɑksi ˌtərmənəs/ΚΠ
1955 E. B. Astwood et al. in G. Pincus & K. V. Thimann Hormones III. vii. 275 Manipulations designed to split off amino acids from either carboxyl or amino termini.]
1966 Proc. National Acad. Sci. U.S.A. 55 843 The carboxy termini of acidic oligopeptides.
1990 Nucleic Acids Res. 18 261/2 An octapeptide sequence, which was later shown to map near the carboxy terminus, was obtained from a tryptic fragment.
2001 S. Baksh et al. in K. F. Austen et al. Therapeutic Immunol. (ed. 2) vi. 92/2 The crystal structure..indicates a defined four-helical bundle with its amino and carboxy termini close together.
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