sumur horizontal

== Indonesian == === Etymology === Compound of sumur (“well”) +‎ horizontal. === Noun === sumur horizontal (plural sumur-sumur horizontal) (mining) horizontal well: a well that is drilled at an angle of more than 80 degrees from vertical, parallel to the zone of interest === Further reading === “sumur horizontal”, in Kamus Besar Bahasa Indonesia [Great Dictionary of the Indonesian Language] (in Indonesian), Jakarta: Agency for Language Development and Cultivation – Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, 2016