ensiform
adjective
en·si·form ˈen(t)-sə-ˌfȯrm 
: having sharp edges and tapering to a slender point
ensiform leaves
see leaf illustration 
Word History
Etymology
French ensiforme, from Latin ensis sword + French -forme -form; akin to Sanskrit asi sword
First Known Use
1541, in the meaning defined above
Medical Definition
ensiform
adjective
en·si·form ˈen(t)-sə-ˌfȯrm
: having sharp edges and tapering to a slender point