Endrinkul is Engineering in Khazalid (-ul suffix signifying skill or mastery of).
It's a pretty safe bet Endrink can be extrapolated as a term meaning Engine, or the root word for anything relating to engines or engineering.
We speculated a few years back that Endrinkuli worked as a term for Master Engineers (in general). Difficult though as there is a fair amount of inconsistency in how GW put the original language together. "Master of" surprisingly, isn't a term we could find, such as Guild Master, Master Craftsman. This may be intentional as we are all on a journey to perfection and even a master engineer is yet to reach his goal.
Rik, meaning King or Lord has been used in a similar sense "Rhunriken Ankor" meaning Runemaster's Lair (domain). Which is also interesting as it has the -en suffix, which could be used as evidence -en signifies ownership like our 's does. (This isn't highlighted in the official language docs).
Endrinkrik or perhaps Endrik could work as Master Engineer. Although the sense of humour of Dwarfs may shorten this to 'Krik', and lead to a mythology surrounding the term "Krik in my neck" from Master Engineers' penchant for cramming themselves in small spaces under machinery as they work.
I really should get back to the lexicon we started, love this stuff