operculum vs sleeve

operculum

noun
  • A structure which serves as a cover or lid. 

  • A covering flap in animals, such as a gill cover. 

  • A gum flap covering (part of) a partially erupted tooth, usually a wisdom tooth. 

  • The lidlike portion of a moss sporangium or of a fruit that detaches to allow the dispersal of spores or seeds. 

  • One of several flaps of cerebral cortex covering the insula. 

sleeve

noun
  • A (usually tubular) covering or lining to protect a piece of machinery etc. 

  • The part of a garment that covers the arm. 

  • A serving of beer smaller than a pint, typically measuring between 12 and 16 ounces. 

  • A double tube of copper into which the ends of bare wires are pushed so that when the tube is twisted an electrical connection is made. The joint thus made is called a McIntire joint. 

  • A long, cylindrical plastic bag of cookies or crackers. 

  • A protective jacket or case, especially for a record, containing art and information about the contents; also the analogous leaflet found in a packaged CD. 

  • Sleave; untwisted thread. 

  • A tattoo covering the whole arm. 

  • A narrow channel of water. 

verb
  • To hide something up one's sleeve. 

  • To fit and attach a sleeve to an upper garment (e.g. to a shirt, blouse, sweater, jacket, coat, etc.) or to a folder. 

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