- In fish, the retrorse (backward) inclination of the myomeres forms a precursor of the differentiation between a deep and a superficial musculature of the trunk.
- As the bee's proboscis is inserted into the flower it pushes past the retrorse anthers to the nectar at the base of the tube.
Early 19th century: from Latin retrorsus, contraction of retroversus, from retro 'backward' + versus 'turned' (past participle of vertere).
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