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trochal disc
[trochal disc 词源字典]
"(In a rotifer) a ring of cilia that is used in feeding and (in most kinds) swimming", Mid 19th century:
trochal
from Greek
trokhos
'wheel' + -al.
[trochal disc etymology, trochal disc origin, 英语词源]
[trochal disc 词源字典]