polytypyn.

Brit.

/ˈpɒlɪtʌɪpi/, U.S.

/ˈpɑliˌtaɪpi/

Origin: Formed within English, by derivation. Etymons: poly- comb. form, type n., -y suffix³, polytype n.

Etymology: In sense 1 < poly- comb. form + type n. + -y suffix³. In sense 2 < polytype n. + -y suffix³; compare German Polytypie (H. Baumhauer 1915, in Zeitschr. f. Kristallogr. u. Mineral. 55 252). Compare polytypism n.

a. The occurrence of several types within a group.

ΚΠ

1906 Amer. Anthropologist 8 710/2 In America there is not merely polytypy in skull-forms but even poikilotypy.

1996 Oceanologica Acta 19 323 Four major areas of polytypy are considered: (1) breeding seasons and cycles vary greatly in time and duration with latitude and from year to year; (2) egg and larval sizes [etc.].

b. Biology. = polytypism n. 1.

ΘΚΠ

the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [noun] > occurrence of variant forms

polymorphism1846

polymorphy1846

heteromorphism1874

polytypism1932

cline1938

topocline1939

polytypy1954

morphism1955

1954 Jrnl. Ecol. 42 570 The ecologically correlated polytypy shown by some species has not arisen as a direct response to local habitat conditions.

1961 G. G. Simpson Princ. Animal Taxon. iv. 135 In cases of extreme polytypy, first consideration should be given to making the taxon less unwieldy by use of intermediate lower taxa or subgroups.

1978 Jrnl. Philos. 75 576 Aristotle's definition of genus entails that every genus has at least two immediate species (the Polytypy thesis).

1990 Evol. Ecol. 4 130 Polytypy and incompleteness of distributions on the large islands indicate that isolation is adequate for differentiation to occur.

1995 J. Marks Human Biodiversity vii. 117 Genetics was expected to reveal the most intimate secrets of human polytypy. Instead, it revealed large amounts of polymorphism.

2. Crystallography. = polytypism n. 2. rare.

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > polymorph > polytype > polytypism

polytypy1934

polytypism1944

1934 T. F. W. Barth in Amer. Jrnl. Sci. 227 274 The polymorphic changes occurring in crystals can..be grouped into three classes... I. A complete alteration of the space-lattice with the formation of a new type of structure... This case could be referred to as polytypy.

1996 Russian Physics Jrnl. 39 66 The results of studies of the piezospectroscopic effect for II-VI semiconductor compounds having a tendency toward polymorphism and polytypy are given.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polytypy
释义	polytypyn. Brit. /ˈpɒlɪtʌɪpi/, U.S. /ˈpɑliˌtaɪpi/ Origin: Formed within English, by derivation. Etymons: poly- comb. form, type n., -y suffix³, polytype n. Etymology: In sense 1 < poly- comb. form + type n. + -y suffix³. In sense 2 < polytype n. + -y suffix³; compare German Polytypie (H. Baumhauer 1915, in Zeitschr. f. Kristallogr. u. Mineral. 55 252). Compare polytypism n. 1. a. The occurrence of several types within a group. ΚΠ 1906 Amer. Anthropologist 8 710/2 In America there is not merely polytypy in skull-forms but even poikilotypy. 1996 Oceanologica Acta 19 323 Four major areas of polytypy are considered: (1) breeding seasons and cycles vary greatly in time and duration with latitude and from year to year; (2) egg and larval sizes [etc.]. b. Biology. = polytypism n. 1. ΘΚΠ the world > life > biology > biological processes > genetic activity > heredity or hereditary descent > [noun] > occurrence of variant forms polymorphism1846 polymorphy1846 heteromorphism1874 polytypism1932 cline1938 topocline1939 polytypy1954 morphism1955 1954 Jrnl. Ecol. 42 570 The ecologically correlated polytypy shown by some species has not arisen as a direct response to local habitat conditions. 1961 G. G. Simpson Princ. Animal Taxon. iv. 135 In cases of extreme polytypy, first consideration should be given to making the taxon less unwieldy by use of intermediate lower taxa or subgroups. 1978 Jrnl. Philos. 75 576 Aristotle's definition of genus entails that every genus has at least two immediate species (the Polytypy thesis). 1990 Evol. Ecol. 4 130 Polytypy and incompleteness of distributions on the large islands indicate that isolation is adequate for differentiation to occur. 1995 J. Marks Human Biodiversity vii. 117 Genetics was expected to reveal the most intimate secrets of human polytypy. Instead, it revealed large amounts of polymorphism. 2. Crystallography. = polytypism n. 2. rare. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > structures and forms > [noun] > polymorph > polytype > polytypism polytypy1934 polytypism1944 1934 T. F. W. Barth in Amer. Jrnl. Sci. 227 274 The polymorphic changes occurring in crystals can..be grouped into three classes... I. A complete alteration of the space-lattice with the formation of a new type of structure... This case could be referred to as polytypy. 1996 Russian Physics Jrnl. 39 66 The results of studies of the piezospectroscopic effect for II-VI semiconductor compounds having a tendency toward polymorphism and polytypy are given. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1906
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