Adjacent Words

Thysanura definitions

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WordNet (r) 3.0 (2005)

n
1: firebrats; silverfish; machilids [syn: Thysanura, order Thysanura]

Webster's 1913 Dictionary

Insecta In*sec"ta, n. pl. [NL. See Insect.] 1. (Zo["o]l.) One of the classes of Arthropoda, including those that have one pair of antenn[ae], three pairs of mouth organs, and breathe air by means of trache[ae], opening by spiracles along the sides of the body. In this sense it includes the Hexapoda, or six-legged insects and the Myriapoda, with numerous legs. See Insect, n. 2. (Zo["o]l.) In a more restricted sense, the Hexapoda alone. See Hexapoda. 3. (Zo["o]l.) In the most general sense, the Hexapoda, Myriapoda, and Arachnoidea, combined. Note: The typical Insecta, or hexapod insects, are divided into several orders, viz.: Hymenoptera, as the bees and ants; Diptera, as the common flies and gnats; Aphaniptera, or fleas; Lepidoptera, or moths and butterflies; Neuroptera, as the ant-lions and hellgamite; Coleoptera, or beetles; Hemiptera, as bugs, lice, aphids; Orthoptera, as grasshoppers and cockroaches; Pseudoneuroptera, as the dragon flies and termites; Euplexoptera, or earwings; Thysanura, as the springtails, podura, and lepisma. See these words in the Vocabulary.

Webster's 1913 Dictionary

Thysanura Thys`a*nu"ra, n. pl. [NL., fr. Gr. ? fringe + ? tail.] (Zo["o]l.) An order of wingless hexapod insects which have setiform caudal appendages, either bent beneath the body to form a spring, or projecting as bristles. It comprises the Cinura, or bristletails, and the Collembola, or springtails. Called also Thysanoura. See Lepisma, and Podura.