Eagle
a score of 2 under (less than) par for a hole
Embedded ball
a ball stuck in the ground as a result of its impact (also "plugged", ”buried”)
Etiquette
rules of behavior, propriety, decorum, manners, etc.
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Even par
anytime one's score is level with, or equivalent to, par during, or at the conclusion of, a round of golf (also "even, level, level par")
Executive course
a golf course with very short holes, mostly par 3's and short par 4's (also: a chip and putt)
Explosion shot
a shot that removes a large amount of sand or earth in addition (hopefully) to the ball, as from a buried lie in a bunker (also "explosion, blast, blast shot")