Strong's #1385: dokos (pronounced dok-os')
 from 1209 (through the idea of holding up); a stick of timber:--beam.
Thayer's Greek Lexicon:
 ́ 
 
  dokos 
 
 1) a beam
 
  Part of Speech: noun feminine
Relation: from G1209 (through the idea of holding up)
 
Usage:
This word is used 6 times:
Matthew 7:3: "considerest not the  beam that is in thine own eye?"
Matthew 7:4: "eye; and, behold,  a beam is in thine own eye?"
Matthew 7:5: "first cast out the  beam out of thine own eye; and"
Luke 6:41: "perceivest not the  beam that is in thine own eye?"
Luke 6:42: "beholdest not the  beam that is in thine own eye?"
Luke 6:42: "cast out first the  beam out of thine own eye, and"