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Webster 1913 Edition

Noun.

[L.

ala

wing +

truncus

trunk.]

(Zool.)

The segment of the body of an insect to which the wings are attached; the thorax.

Kirby.

alitrunk ‎(plural alitrunks)

(zoology) The segment of an insect's body to which the wings are attached; the thorax or mesosoma.
(Can we find and add a quotation of Kirby to this entry?)

segment of an insect's body to which the wings are attached