ptilinum

noun
pti·​li·​num | \ -nəm\
plural ptilina\ -​nə \

Definition of ptilinum

: a vesicular organ on the front of the head of flies that assists in rupturing the pupa case and shortly afterward shrinks away

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History and Etymology for ptilinum

New Latin, probably from ptil- + Latin -inum (neuter of -inus -ine)

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