• Webster's Revised Unabridged Dictionary
    • Suctoria An order of Infusoria having the body armed with somewhat stiff, tubular processes which they use as suckers in obtaining their food. They are usually stalked.
    • Suctoria Same as Rhizocephala.
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Century Dictionary and Cyclopedia
    • suctoria Suctorial animals: applied to various zoölogical groups in which the mouth is suctorial, haustellate, siphonostomous, or otherwise fitted for sucking. Specifically— In ichthyology, the cyclostomous fishes, or myzonts; the lampreys and hags, having the mouth formed into a sucker; in Cuvier's system, the second family of Chondropterygii branchiis fixis, later called Cyclostomata, or Cyclostomi, and Myzontes, and now known as the class Marsipobranchii. Also Suctorii. See cut under lamprey.
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Webster's Revised Unabridged Dictionary
NL. See Suction


In literature:

Instrumenta suctoria: mouth parts of a haustellate insect as a whole.
"Explanation of Terms Used in Entomology" by John. B. Smith
He considered it to "undoubtedly" belong to the Suctoria of De Geer, and to form a new genus of Pulicidae.
"Scientific American Supplement, No. 648, June 2, 1888." by Various
The stalk is usually solid, and expanded at the base into a disk in Suctoria.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 5" by Various