nematocyst

[ nem-uh-tuh-sist, ni-mat-uh- ]

noun

, Zoology.

1. an organ in coelenterates consisting of a minute capsule containing an ejectable thread that causes a sting.

nematocyst

/ nɪˈmætə-; ˈnɛmətəˌsɪst /

noun

1. 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

nematocyst

/ nĕm′ə-tə-sĭst′,nĭ-măt′ə-sĭst′ /

1. One of the minute capsules in the tentacles of cnidarians, such as jellyfish, hydras, or sea anemones, used for stinging. The capsule is produced by a special cell (called a cnidoblast) and contains a tightly coiled barbed thread that quickly shoots forth if the capsule's lid is disturbed. The thread often contains poison.

Derived Forms

• ˌnematoˈcystic, adjective

Other Words From

• nema·to·cystic adjective

Word History and Origins

Origin of nematocyst¹

First recorded in 1870–75; nemato- + -cyst

Example Sentences

The cnidoblasts are the mother-cells of the nematocysts, each cell producing one nematocyst in its interior.

From Project Gutenberg

The entire nematocyst is enclosed in the cnidoblast which formed it.

From Project Gutenberg