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pessulus

noun pes·su·lus \ -ləs \
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Definition of pessulus

plural pessuli \-ˌlī\
: a bony or cartilaginous bar crossing the lower end of the windpipe of a bird dorsoventrally at its division into bronchi

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Origin and Etymology of pessulus

Latin, bolt, modification of Greek passalos peg, stake; akin to Greek pēgnynai to fix, fasten together

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