Crostrees or Crosstrees: How To spell?
The word Crostrees is misspelled against Crosstrees, a noun meaning "Pieces of timber at a masthead, to which are attached the upper shrouds. At the head of lower masts in large vessels, they support a semicircular platform called the "top.""
Crosstrees has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings cro & trees which should not be misspelled with single 'S'
Wrong Spelling:  cro-s-trees  Correct Spelling:  cro-ss-trees 
Find more incorrect spellings of Crosstrees to spell right way.