coleophyll, -phylBot.|ˈkɒliːəʊˌfɪl| [ad.mod.L. coleophyllum, f.Gr. κολεός sheath + ϕύλλον leaf.] (See quot.) 1866Treas.Bot., Coleophyll, or Coleoptile, the first leaf which follows the cotyledon in endogens, and ensheaths the succeeding leaves. Hence ˌcoleoˈphyllousa., having a coleophyll.