accretion borer

15 LETTERS · STARTS WITH A

accretion borer is a valid 15-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

A1C3C3R1E1T1I1O1N1B3O1R1E1R1

1 + 3 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does accretion borer mean?