PROJECTILE
Pro*ject"ile, n. Etym: [Cf. F. projectile.]
1. A body projected, or impelled forward, by force; especially, a missile adapted to be shot from a firearm.
2. pl. (Mech.)
Defn: A part of mechanics which treats of the motion, range, time of flight, etc., of bodies thrown or driven through the air by an impelling force.
PROJECTION
Pro*jec"tion, n. Etym: [L. projectio: cf. F. projection.]
1. The act of throwing or shooting forward.
2. A jutting out; also, a part jutting out, as of a building; an extension beyond something else.
3. The act of scheming or planning; also, that which is planned; contrivance; design; plan. Davenant.
4. (Persp.)
Defn: The representation of something; delineation; plan; especially, the representation of any object on a perspective plane, or such a delineation as would result were the chief points of the object thrown forward upon the plane, each in the direction of a line drawn through it from a given point of sight, or central point; as, the projection of a sphere. The several kinds of projection differ according to the assumed point of sight and plane of projection in each.