anallatic
/anəˈlatɪk/(also anallactic) Surveying
adjective
Of a surveying telescope: having an additional lens between the eyepiece and the object lens, positioned to enable the horizontal distance to be calculated from the slant distance without the need for a correcting factor; (of a lens) serving to make a telescope anallatic.
Origin
Late 19th century. From French anallatique, with remodelling of the ending after -ic.