n. organ in the protoplasm of some single-celled organisms which can eject a filament for purposes of offense or defense

English contemporary dictionary. 2014.

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  • Trichocyst — A trichocyst is a structure in the cortex of certain ciliate and flagellate protozoans consisting of a cavity and long, thin threads that can be ejected in response to certain stimuli. Trichocysts may be widely distributed over an organism or… …   Wikipedia

  • trichocyst — trichocystic, adj. /trik euh sist /, n. Zool. an organ of offense and defense embedded in the outer cytoplasm of certain protozoans, consisting of a small elongated sac containing a fine, hairlike filament capable of being ejected. [1850 55;… …   Universalium

  • algae — algal, adj. /al jee/,, sing. alga / geuh/. any of numerous groups of chlorophyll containing, mainly aquatic eukaryotic organisms ranging from microscopic single celled forms to multicellular forms 100 ft. (30 m) or more long, distinguished… …   Universalium

  • trich|o|cyst|ic — «TRIHK uh SIHS tihk», adjective. 1. having to do with trichocysts. 2. having the character of trichocysts: »a trichocystic formation …   Useful english dictionary

  • Cryptomonad — Cryptomonads Rhodomonas salina Scientific classification Domain: Eukaryota …   Wikipedia

  • Nassophorea — Scientific classification Domain: Eukaryota Kingdom: Chromalveolata Superphylum: Alveolata …   Wikipedia

  • Peniculid — Taxobox | color = #FA7B62 name = Peniculids image caption = Paramecium aurelia domain = Eukaryota regnum = Chromalveolata superphylum = Alveolata phylum = Ciliophora classis = Oligohymenophorea ordo = Peniculida ordo authority = Fauré Fremiet in… …   Wikipedia

  • Extrusome — Extrusomes are membrane bound structures in some eukaryotes which, under certain conditions, discharge their contents outside the cell. There are a variety of different types, probably not homologous, and serving various functions. Notable… …   Wikipedia

  • ciliate — ciliately, adv. ciliation, n. /sil ee it, ayt /, Biol. n. 1. Also called ciliophoran /sil ee of euhr euhn/. any protozoan of the phylum Ciliophora (or in some classification schemes, class Ciliata), as those of the genera Paramecium, Tetrahymena …   Universalium

  • paramecium — /par euh mee shee euhm, sheuhm, see euhm/, n., pl. paramecia / shee euh, see euh/. any ciliated freshwater protozoan of the genus Paramecium, having an oval body and a long, deep oral groove. [1745 55; < NL < Gk paramék(es) oblong, oval + NL ium… …   Universalium