nipple cactus vs pincushion

nipple cactus

noun
  • Any of a number of mammiform cacti of the genus Mammillaria. 

pincushion

noun
  • The pincushion cactus, of the genera Escobaria or Mammillaria. 

  • The pincushionplant, a flowering plant in the genus Navarretia. 

  • A device, originally like a small, stuffed cushion, designed to have sewing pins and needles stuck into it to store them safely; some modern pincushions hold the objects magnetically. 

  • A flowering plant in the genus Leucospermum. 

  • The dustymaiden, a flowering plant in the genus Chaenactis. 

  • A person who is pricked or stabbed multiple times with sharp objects; specifically, someone who receives regular hypodermic needle injections. 

  • The coral bead plant, coral moss, or English baby tears (Nertera granadensis), an ornamental plant. 

  • A flowering plant in the genus Scabiosa. 

verb
  • To jab or stick repeatedly with one or more sharp objects, as with pins into a pincushion. 

  • To assume the shape of a pincushion; specifically, of the image on a computer display, television, etc., to exhibit pincushion distortion, where the sides curve inwards. 

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