Almacantar

• (n.) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar. • (n.) Same as Almucantar.
Found on http://thinkexist.com/dictionary/meaning/almacantar/

Almacantar

Al`ma·can'tar noun (Astron.) (a) Same as Almucantar . (b) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar .
Found on http://www.encyclo.co.uk/webster/A/60

almacantar

circle of altitude, parallel to the horizon
Found on http://phrontistery.info/a.html
No exact match found