Definition of costean in English:

costean

(also costeen)

noun

Cornwall
Mining
  • A pit or trench sunk through surface deposits in order to locate a vein of ore and ascertain its extent.

verb

Cornwall
Mining
  • no object To sink a costean.

Origin

Late 18th century; earliest use found in William Pryce (d. 1790), surgeon, mineralogist, and antiquary. Origin uncertain; perhaps from an otherwise unattested Cornish phrase or compound from a first element of uncertain origin + sten tin<br>mid 19th century; earliest use found in Cornwall Royal Gazette. From costean.

Pronunciation

costean

/kɒˈstiːn/