[soh-sid, sos-id]
any of numerous minute winged insects of the family Psocidae (order Psocoptera), including most of the common barklice, having mouth parts adapted for chewing and feeding on fungi, lichens, algae, decaying plant material, etc., and occurring on the bark of trees and the leaves of plants.
any member of the order Psocoptera, comprising the booklice and barklice.

1890–95; < Neo-Latin Psocidae, equivalent to Psoc(us) name of a genus (< Greek psôchos dust) + -idae -id2

psocine [soh-sahyn, sos-ahyn] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica


any of a group of about 5,000 species of soft-bodied insects, usually less than 5 mm (0.2 inch) long. Its slender antennae are at least as long as its body, and wing venation is simple, with no crossveins. Mouthparts are adapted for chewing, with the upper jaw usually elongated and chisel-like. Psocids eat fungi (including molds), cereals, pollen, and organic debris.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
For the psocid species, the depth of the treated layer was the decisive factor for adult mortality.
Knowledge of the suitability of different cereal grains for psocid pests is important for their management.
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