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olfactometer
olfactory
olfactory bulb
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Oligocene
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oligochaete

ol·i·go·chaete [ ólligō kt, ə líggə kt ] (plural ol·i·go·chaetes)


noun 
Definition:
 
earthworm or related worm: a freshwater or terrestrial worm such as an earthworm that has a body consisting of numerous similar segments with projections resembling bristles. Class Oligochaeta.

[Late 19th century. < modern Latin Oligochaeta "small or few bristles"]
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