mizzen vs posticous

mizzen

adj

  • Hindmost; nearest the stern. 

noun

  • A fore-and-aft sail set on a mizzenmast. 

  • Mizzenmast. 

posticous

adj

  • posterior 

  • Situated on the outer side of a filament; said of an extrorse anther. 

How often have the words mizzen and posticous occurred in a corpus of books? (source: Google Ngram Viewer )