Protozoan.

Brit.

/ˌprəʊtə(ʊ)ˈzəʊə/, U.S.

/ˌproʊdəˈzoʊə/

Origin: A borrowing from Latin. Etymon: Latin Protozoa.

Etymology: < scientific Latin Protozoa ( G. A. Goldfuss Ueber die Entwicklungsstufen des Thieres (1818), diagram at end) < proto- proto- comb. form + ancient Greek ζῷα (see -zoa comb. form).

Biology.

With singular agreement: a group of phyla of the kingdom Protista (formerly also treated as a single phylum of the animal kingdom), comprising chiefly unicellular and microscopic eukaryotic animals, including amoebas, foraminiferans, radiolarians, flagellates, ciliates, sporozoans, etc. With plural agreement: (also in form protozoa) such animals collectively; protozoans. Cf. Protophyta n.Goldfuss's group also included sponges, coelenterates, rotifers, and bryozoans. Von Siebold, in his Lehrb. der vergleichenden Anatomie der wirbillosen Thiere (1845), restricted it to the unicellular animals, which are now generally considered to be merely a loose collection of phyla, rather than forming a discrete taxon.protozoon n. is used as the singular form.

ΘΚΠ

the world > animals > invertebrates > protozoa > [noun]

cryptozoa1794

Protozoa1825

oozoa1835

hypozoa1887

1825 S. T. Coleridge Notebks. (2002) IV. 5266 The..substance, obtained by Braconnot by washing off the soluble ingredients of Mushrooms..and which in the results of putrefaction, the disengagement of Ammonia & Azote approaches so near to animal substances—joins with the protozoa in proving the priority of Animal Life—or rather that Life is radically animal.

1855 H. Spencer Princ. Psychol. iii. v. 377 Those lowest organisms classed as protophyta and protozoa.

1859 J. R. Greene Man. Animal Kingdom I. i. 1 The sub-kingdom Protozoa includes a number of animal beings of simple organisation, many of which have, until recently, been associated with the lower members of the vegetable kingdom.

1877 T. H. Huxley Man. Anat. Invertebrated Animals i. 47 A similar process takes place in sundry Protozoa and gives rise to a protozoic aggregate, which is strictly comparable to the Morula.

1900 Science 21 Dec. 941/2 Reproduction of the Protozoa is accomplished either by their division into two or more individuals of equal size or by the pinching off of small daughter animals from a larger mother.

a1933 J. A. Thomson Biol. for Everyman (1934) I. ii. 19 Lowest of all are the Unicellular Animals or Protozoa. They do not form a body in the strict sense; they are mostly microscopic and aquatic.

1962 Lab. Investig. 11 1073/1 Opportunistic infections by bacteria, viruses, and protozoa are known.

1991 R. A. Fortey Fossils (ed. 2) (BNC) 55 A large and heterogeneous collection of organisms are grouped in the Protozoa, including all those animals that can lead an autonomous existence as a single cell.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online June 2022).

单词	protozoa
释义	Protozoan. Brit. /ˌprəʊtə(ʊ)ˈzəʊə/, U.S. /ˌproʊdəˈzoʊə/ Origin: A borrowing from Latin. Etymon: Latin Protozoa. Etymology: < scientific Latin Protozoa ( G. A. Goldfuss Ueber die Entwicklungsstufen des Thieres (1818), diagram at end) < proto- proto- comb. form + ancient Greek ζῷα (see -zoa comb. form). Biology. With singular agreement: a group of phyla of the kingdom Protista (formerly also treated as a single phylum of the animal kingdom), comprising chiefly unicellular and microscopic eukaryotic animals, including amoebas, foraminiferans, radiolarians, flagellates, ciliates, sporozoans, etc. With plural agreement: (also in form protozoa) such animals collectively; protozoans. Cf. Protophyta n.Goldfuss's group also included sponges, coelenterates, rotifers, and bryozoans. Von Siebold, in his Lehrb. der vergleichenden Anatomie der wirbillosen Thiere (1845), restricted it to the unicellular animals, which are now generally considered to be merely a loose collection of phyla, rather than forming a discrete taxon.protozoon n. is used as the singular form. ΘΚΠ the world > animals > invertebrates > protozoa > [noun] cryptozoa1794 Protozoa1825 oozoa1835 hypozoa1887 1825 S. T. Coleridge Notebks. (2002) IV. 5266 The..substance, obtained by Braconnot by washing off the soluble ingredients of Mushrooms..and which in the results of putrefaction, the disengagement of Ammonia & Azote approaches so near to animal substances—joins with the protozoa in proving the priority of Animal Life—or rather that Life is radically animal. 1855 H. Spencer Princ. Psychol. iii. v. 377 Those lowest organisms classed as protophyta and protozoa. 1859 J. R. Greene Man. Animal Kingdom I. i. 1 The sub-kingdom Protozoa includes a number of animal beings of simple organisation, many of which have, until recently, been associated with the lower members of the vegetable kingdom. 1877 T. H. Huxley Man. Anat. Invertebrated Animals i. 47 A similar process takes place in sundry Protozoa and gives rise to a protozoic aggregate, which is strictly comparable to the Morula. 1900 Science 21 Dec. 941/2 Reproduction of the Protozoa is accomplished either by their division into two or more individuals of equal size or by the pinching off of small daughter animals from a larger mother. a1933 J. A. Thomson Biol. for Everyman (1934) I. ii. 19 Lowest of all are the Unicellular Animals or Protozoa. They do not form a body in the strict sense; they are mostly microscopic and aquatic. 1962 Lab. Investig. 11 1073/1 Opportunistic infections by bacteria, viruses, and protozoa are known. 1991 R. A. Fortey Fossils (ed. 2) (BNC) 55 A large and heterogeneous collection of organisms are grouped in the Protozoa, including all those animals that can lead an autonomous existence as a single cell. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online June 2022). < n.1825
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