noun (plural rectrices /-ˌtrəsēz/)Ornithology
Any of the larger feathers in a bird’s tail, used for steering in flight. Compare with remex.
- I plucked the outer right rectrix (tail feather), thereby inducing the growth of a replacement.
- We also removed the central rectrix from the right side of the tail of each adult to determine feather growth rate.
- Most birds showed signs of moderate to heavy wear of the secondary coverts and rectrices.
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