nematocyst

nem·a·to·cyst

N0055300 (nĕm′ə-tə-sĭst′, nĭ-măt′ə-)n. A capsule within specialized cells in the tentacles of cnidarians, such as jellyfish and corals, containing a barbed, threadlike tube that delivers a toxic sting to predators and prey.

nem′a·to·cys′tic adj.

nematocyst

(ˈnɛmətəˌsɪst; nɪˈmætə-) n (Zoology) a structure in coelenterates, such as jellyfish, consisting of a capsule containing a hollow coiled thread that can be everted to sting or paralyse prey and enemies ˌnematoˈcystic adj

nem•a•to•cyst

(ˈnɛm ə təˌsɪst, nɪˈmæt ə-)

n. one of the tiny organs in jellyfish and other coelenterates that uncoils a threadlike poisonous stinger when irritated. [1870–75] nem`a•to•cys′tic, adj.

nem·a·to·cyst

(nĕm′ə-tə-sĭst′, nĭ-măt′ə-sĭst′) One of the stinging cells in the tentacles of a jellyfish, hydra, or related animal, used to capture prey and ward off attackers.

Nematocyst

nematocyst

[nə′mad·ə‚sist] (invertebrate zoology) An intracellular effector organelle in the form of a coiled tube which may be rapidly everted in food gathering or defense by cnidarians.

Nematocyst

(also stinging cell, nettling cell), a unique cell in the ectoderm and endoderm of most coelenterates (with the exception of ctenophorans) whose function is to attack prey and protect against enemies. A nematocyst contains a thin-walled capsule whose cavity contains a spirally coiled thread. The nucleus is situated at the base of the cell. A nematocyst has a sensory extension called a cnidocil projecting from the surface. When stimulated chemically or mechanically, the cnidocil forcefully ejects a straight, untwisted thread into the prey’s body. The sting kills small animals and sometimes causes painful burns and even death in large animals. A nematocyst can be used only once, after which it is discarded and replaced by a new one formed with specialized cells.

nematocyst

enUK

nem·a·to·cyst

(nem'ă-tō-sist), A stinging cell of coelenterates consisting of a poison sac and a coiled barbed sting capable of being ejected and penetrating the skin of an animal on contact; of considerable consequence in large jellyfish and in the Portuguese man-of-war which possess large numbers of these stinging cells that can cause great pain and even death. Synonym(s): cnida, cnidocyst [nemato- + G. kystis, bladder]

nematocyst

(nĕm′ə-tə-sĭst′, nĭ-măt′ə-)n. A capsule within specialized cells in the tentacles of cnidarians, such as jellyfish and corals, containing a barbed, threadlike tube that delivers a toxic sting to predators and prey.

nem′a·to·cys′tic adj.

nem·a·to·cyst

(nem'ă-tō-sist) A stinging cell of coelenterates consisting of a poison sac and a coiled barbed sting capable of being ejected and penetrating the skin of an animal on contact; of considerable consequence in large jellyfish and in the Portuguese man-of-war whose large numbers of these stinging cells can cause great pain and even death. [nemato- + G. kystis, bladder]

nematocyst

A coiled, tube-like stinging organ of various coelenterates, such as jellyfish. The nematocyst injects a chemical paralyzant.

Fig. 227 Nematocyst . Nematocysts of Hydra. (a) Discharged. (b) Undischarged.

nematocyst

a structure formed of a hollow thread within a bladder in the CNIDOBLAST or thread cell of COELENTERATES. On stimulation, for example by prey, the thread is everted. Several types exist, such as stinging cells that inject poisonous substances into the prey through the thread, and sticky cells which exude a sticky substance which causes the prey to adhere to the coelenterate tentacle. Enormous numbers are present on the tentacles of some forms and nematocysts are responsible for the jellyfish ‘sting’. Such cells can be utilized by other organisms, for example flatworms preying on coelenterates. The nematocysts migrate to the surface layer of a flatworm which has fed on the coelenterate and are used by the flatworms in exactly the same way as coelenterates use them.

单词	nematocyst
释义	nematocyst enUK nem·a·to·cyst N0055300 (nĕm′ə-tə-sĭst′, nĭ-măt′ə-)n. A capsule within specialized cells in the tentacles of cnidarians, such as jellyfish and corals, containing a barbed, threadlike tube that delivers a toxic sting to predators and prey. nem′a·to·cys′tic adj. nematocyst (ˈnɛmətəˌsɪst; nɪˈmætə-) n (Zoology) a structure in coelenterates, such as jellyfish, consisting of a capsule containing a hollow coiled thread that can be everted to sting or paralyse prey and enemies ˌnematoˈcystic adj nem•a•to•cyst (ˈnɛm ə təˌsɪst, nɪˈmæt ə-) n. one of the tiny organs in jellyfish and other coelenterates that uncoils a threadlike poisonous stinger when irritated. [1870–75] nem`a•to•cys′tic, adj. nem·a·to·cyst (nĕm′ə-tə-sĭst′, nĭ-măt′ə-sĭst′) One of the stinging cells in the tentacles of a jellyfish, hydra, or related animal, used to capture prey and ward off attackers. Nematocyst enUK nematocyst [nə′mad·ə‚sist] (invertebrate zoology) An intracellular effector organelle in the form of a coiled tube which may be rapidly everted in food gathering or defense by cnidarians. Nematocyst (also stinging cell, nettling cell), a unique cell in the ectoderm and endoderm of most coelenterates (with the exception of ctenophorans) whose function is to attack prey and protect against enemies. A nematocyst contains a thin-walled capsule whose cavity contains a spirally coiled thread. The nucleus is situated at the base of the cell. A nematocyst has a sensory extension called a cnidocil projecting from the surface. When stimulated chemically or mechanically, the cnidocil forcefully ejects a straight, untwisted thread into the prey’s body. The sting kills small animals and sometimes causes painful burns and even death in large animals. A nematocyst can be used only once, after which it is discarded and replaced by a new one formed with specialized cells. nematocyst enUK nem·a·to·cyst (nem'ă-tō-sist), A stinging cell of coelenterates consisting of a poison sac and a coiled barbed sting capable of being ejected and penetrating the skin of an animal on contact; of considerable consequence in large jellyfish and in the Portuguese man-of-war which possess large numbers of these stinging cells that can cause great pain and even death. Synonym(s): cnida, cnidocyst [nemato- + G. kystis, bladder] nematocyst (nĕm′ə-tə-sĭst′, nĭ-măt′ə-)n. A capsule within specialized cells in the tentacles of cnidarians, such as jellyfish and corals, containing a barbed, threadlike tube that delivers a toxic sting to predators and prey. nem′a·to·cys′tic adj. nem·a·to·cyst (nem'ă-tō-sist) A stinging cell of coelenterates consisting of a poison sac and a coiled barbed sting capable of being ejected and penetrating the skin of an animal on contact; of considerable consequence in large jellyfish and in the Portuguese man-of-war whose large numbers of these stinging cells can cause great pain and even death. [nemato- + G. kystis, bladder] nematocyst A coiled, tube-like stinging organ of various coelenterates, such as jellyfish. The nematocyst injects a chemical paralyzant. Fig. 227 Nematocyst . Nematocysts of Hydra. (a) Discharged. (b) Undischarged. nematocyst a structure formed of a hollow thread within a bladder in the CNIDOBLAST or thread cell of COELENTERATES. On stimulation, for example by prey, the thread is everted. Several types exist, such as stinging cells that inject poisonous substances into the prey through the thread, and sticky cells which exude a sticky substance which causes the prey to adhere to the coelenterate tentacle. Enormous numbers are present on the tentacles of some forms and nematocysts are responsible for the jellyfish ‘sting’. Such cells can be utilized by other organisms, for example flatworms preying on coelenterates. The nematocysts migrate to the surface layer of a flatworm which has fed on the coelenterate and are used by the flatworms in exactly the same way as coelenterates use them.
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