second hand vs secondhand

second hand

noun
  • On a clock or watch, the hand or pointer that shows the number of seconds that have passed. 

  • An intermediate person or means; intermediary. 

secondhand

adj
  • inhaled from the air near someone else smoking. 

  • Not new; previously owned and used by another. 

  • Indirect; from a secondary source; not firsthand. 

  • Dealing in such merchandise. 

noun
  • Secondhand goods (especially clothes) collectively. 

adv
  • In a used or previously-owned condition. 

  • indirectly 

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