1571 Digges Geometrical Practise ii. iv, Mj. b,Of Acuti⁓angle Triangles, called Oxigonia, there are three kindes. 
acuti-
combining form 
Etymology: Medieval Latin, from Latin acutus — more at acute 
 : sharp-pointed 
< acutifoliate >
: sharply angled
< acutiplantar >
< acutifoliate >
: sharply angled
< acutiplantar >