• WordNet 3.6
    • n Brachyura an order of crustaceans (including true crabs) having a reduced abdomen folded against the ventral surface
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Webster's Revised Unabridged Dictionary
    • n. pl Brachyura (Zoöl) A group of decapod Crustacea, including the common crabs, characterized by a small and short abdomen, which is bent up beneath the large cephalo-thorax. Brachyoura See Crab, and Illustration in Appendix.
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Century Dictionary and Cyclopedia
    • brachyura A group of short-tailed stalk-eyed decapodous crus-taceans, such as ordinary crabs: opposed to Macrura (which see). The short and small tail, or abdomen, is closely folded under the cephalothorax, forming the apron. The Brachyura are sometimes artificially divided into four groups, Oxystomata, Oxyrhyncha, Cyclometopa, and Catametopa; now more frequently into about 16 families, without superfamily grouping.
    • brachyura In mammalogy, a group of short-tailed bats, the same as Emballonuridæ (which see).
    • brachyura Also Brachyoura.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. brachy`s short + o'yra` tail


In literature:

Cancer, Crustacea, Mollusca, Brachyura.
"Putnam's Word Book" by Louis A. Flemming
This is seen, for example, in the Brachyura among the Decapoda.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various