(This rope or chain is called a decametre).    From Wordnik.com.  [Chapter 4] Reference

If you have a rope long enough, you can yourself make a decametre.    From Wordnik.com.  [Chapter 4] Reference

In short (excuse the pun), for one reason or another users in the UK would be better served by a better dictionary of abbreviations than this; US users should be alerted to the fact that the text is British, unedited for American spelling: for ` decagramme, decalitre, decametre 'read ` decagram, decaliter, decameter.'.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol XVIII No 2] Reference

"Ten metres make a decametre, and one thousand metres make a kilometre, and ten thousand metres make a myriametre.    From Wordnik.com.  [Asiatic Breezes Students on The Wing] Reference

That will give you a decametre.    From Wordnik.com.  [Chapter 4] Reference