Strong's G3718 — ὀρθοτομέω (verb)
orthotomeo (or-thot-om-eh'-o) v.
1. to make a straight cut
2. (figuratively) to dissect (expound) correctly (the divine message)
[from a compound of G3717 and the base of G5114]
KJV: rightly divide 
Root(s): G3717, G5114 
Hebrew root: τομώτερος
Occurrences: 1