columnar epithelium
http://purl.obolibrary.org/obo/UBERON_0012274
An epithelium that consists of columnar epithelial cells. Columnar epithelia are epithelial cells whose heights are at least four times their width. Columnar epithelia are divided into simple (or unilayered), and the rarer stratified (or multi-layered).[WP, modified]. [ http://en.wikipedia.org/wiki/Columnar_epithelium ]