cnidan.

/ˈknʌɪdə/

Forms: Plural cnidæ.

Etymology: modern Latin, < Greek κνίδη nettle.

Zoology.

The nettle cell (urticating, or thread cell) of the Cœlenterata (jellyfish, hydra, etc.), in which their power of stinging resides: usually called nematocyst. Hence [combining form cnido-] , ˈcnidoblast n. [Greek βλαστός germ] the cell in which a nematocyst is developed. ˈcnidocell n. = cnida n. ˈcnidocil n. [ < Latin cilium, compare cil n.] the external irritable ciliary process of a cnidoblast. ˈcnidocyst n. a nematocyst. cniˈdogenous adj. producing or containing nematocysts. ˈcnidophore n. [Greek -ϕορος bearing] a process bearing a ‘battery’ of cnidoblasts. ˈcnidosac n. the dilated middle part of a tentillum in certain Siphonophora.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > member of > parts of > cell in which power of stinging resides

thread-cell1859

nematocyst1868

cnida1876

nemocyst1878

stinging-cell1885

cnidocyst1888

colloblast1900

the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > order Siphonophora > member of > twig which covers tentacle > middle part of

cnidosac1888

the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > producing or having nematocysts

teliferous1860

cnidogenous1902

1876 A. Macalister Animal Morphol. 80 In the protoplasmic ectoderm exist scattered or clustered nettle-cells (cnidæ or trichocysts) which are minute oval capsules filled with fluid..lined by a delicate membrane which at the apex is involuted into an axial tube, ending in a long coiled barbed thread.

1884 A. Sedgwick & F. G. Heathcote tr. C. Claus Elem. Text-bk. Zool.: Protozoa to Insecta 223 Each Cnidoblast..possesses a fine superficial plasmatic process (Cnidocil), which is probably very sensitive to mechanical stimuli and occasions the bursting of the capsule.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 331 The nematocysts are removed from the cells or cnidoblasts in which they were developed, and where they usually remain until discharged.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 331 The discharge of the thread is therefore brought about through..direct mechanical or chemical irritation of the cnidocil.

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 757 Some of the hydranths are furnished with a single basal horn-like process—the cnidophore—armed terminally with a battery of cnidoblasts.

1888 E. Haeckel in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXVIII. 259 Large ensiform or spindle-shaped cnidocysts.

1888 E. Haeckel in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXVIII. 259 The cnidosac (sacculus or urticating knob) is ovate, spindle-shaped, or pyriform.

1898 A. Sedgwick Student's Text-bk. Zool. I. 146 The swelling of the cnidosac is due to a rich development of nematocysts of various kinds, forming the battery.

1902 Encycl. Brit. XXX. 797/1 The hepatic cæca in the dorsal papillæ of Eolidoida actually communicate with the cnidogenous sacs at their extremity; cnidocysts are absent from Eolis glaucoides.

1940 Chambers's Techn. Dict. 171/1 Cnidosac, in Siphonophora, a battery of cnidoblasts borne on a tentacle, where it gives rise to a coloured swelling.

This entry has not yet been fully updated (first published 1891; most recently modified version published online September 2020).

单词	cnida
释义	cnidan. /ˈknʌɪdə/ Forms: Plural cnidæ. Etymology: modern Latin, < Greek κνίδη nettle. Zoology. The nettle cell (urticating, or thread cell) of the Cœlenterata (jellyfish, hydra, etc.), in which their power of stinging resides: usually called nematocyst. Hence [combining form cnido-] , ˈcnidoblast n. [Greek βλαστός germ] the cell in which a nematocyst is developed. ˈcnidocell n. = cnida n. ˈcnidocil n. [ < Latin cilium, compare cil n.] the external irritable ciliary process of a cnidoblast. ˈcnidocyst n. a nematocyst. cniˈdogenous adj. producing or containing nematocysts. ˈcnidophore n. [Greek -ϕορος bearing] a process bearing a ‘battery’ of cnidoblasts. ˈcnidosac n. the dilated middle part of a tentillum in certain Siphonophora. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > member of > parts of > cell in which power of stinging resides thread-cell1859 nematocyst1868 cnida1876 nemocyst1878 stinging-cell1885 cnidocyst1888 colloblast1900 the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > order Siphonophora > member of > twig which covers tentacle > middle part of cnidosac1888 the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > producing or having nematocysts teliferous1860 cnidogenous1902 1876 A. Macalister Animal Morphol. 80 In the protoplasmic ectoderm exist scattered or clustered nettle-cells (cnidæ or trichocysts) which are minute oval capsules filled with fluid..lined by a delicate membrane which at the apex is involuted into an axial tube, ending in a long coiled barbed thread. 1884 A. Sedgwick & F. G. Heathcote tr. C. Claus Elem. Text-bk. Zool.: Protozoa to Insecta 223 Each Cnidoblast..possesses a fine superficial plasmatic process (Cnidocil), which is probably very sensitive to mechanical stimuli and occasions the bursting of the capsule. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 331 The nematocysts are removed from the cells or cnidoblasts in which they were developed, and where they usually remain until discharged. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 331 The discharge of the thread is therefore brought about through..direct mechanical or chemical irritation of the cnidocil. 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 757 Some of the hydranths are furnished with a single basal horn-like process—the cnidophore—armed terminally with a battery of cnidoblasts. 1888 E. Haeckel in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXVIII. 259 Large ensiform or spindle-shaped cnidocysts. 1888 E. Haeckel in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXVIII. 259 The cnidosac (sacculus or urticating knob) is ovate, spindle-shaped, or pyriform. 1898 A. Sedgwick Student's Text-bk. Zool. I. 146 The swelling of the cnidosac is due to a rich development of nematocysts of various kinds, forming the battery. 1902 Encycl. Brit. XXX. 797/1 The hepatic cæca in the dorsal papillæ of Eolidoida actually communicate with the cnidogenous sacs at their extremity; cnidocysts are absent from Eolis glaucoides. 1940 Chambers's Techn. Dict. 171/1 Cnidosac, in Siphonophora, a battery of cnidoblasts borne on a tentacle, where it gives rise to a coloured swelling. This entry has not yet been fully updated (first published 1891; most recently modified version published online September 2020). < n.1876
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