Shaped like the head of a lance or leaves; narrow and tapered toward the the distal end and sometimes towards both ends. A term used to describe a major projectile point form that has no notches or shoulders or definable stem. Bases can be round, straight, concave, convex. A sub-type form of Lanceolate could be Lanceolate-Triangular.
Source: LITHICS-Net, Glossary of Lithics Terminology