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orthotropic
orthotropous
orthovoltage
orthovoltage therapy
ortolan
ORV
Orvieto
-ory
oryx
orzo
OS
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orthopteran

or·thop·ter·an [ àwr thóptərən ] or or·thop·ter·on [ àwr thóptərən ]


noun  (plural or·thop·ter·ans) (plural or·thop·ter·ons)
Definition:
 
primitive insect: a member of the order Orthoptera of primitive winged insects such as cockroaches, mantises, locusts, and crickets



adjective 
Definition:
 
insects 
Same as  orthopterous


[Late 19th century. < modern Latin Orthoptera (plural) "those with straight wings" < Greek pteron "wing"]
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