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trichoptile
trichoptile n. 
/trᵻˈkɒptʌɪl/, /trʌɪˈkɒptɪl/, /trʌɪˈkɒptʌɪl/, /trəˈkɑpˌtaɪl/ Ornithology a hair-like prolongation of the sheath of a growing feather, forming part of the downy covering of the young of certain birds.
Brit. /trᵻˈkɒptɪl/
, /trᵻˈkɒptɪl//trᵻˈkɒptʌɪl//trʌɪˈkɒptɪl//trʌɪˈkɒptʌɪl/U.S. /trəˈkɑpt(ə)l/
, /trəˈkɑpt(ə)l//trəˈkɑpˌtaɪl/ΘΚΠ
the world > animals > birds > feather > [noun] > down or down-feather > on unfledged bird > part of
trichoptile1900
1900 Ibis Oct. 654 I shall term these thread-like structures trichoptiles.
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