prothetic vowel

15 LETTERS · STARTS WITH P

prothetic vowel is a valid 15-letter word worth 27 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

P3R1O1T1H4E1T1I1C3V4O1W4E1L1

3 + 1 + 1 + 1 + 4 + 1 + 1 + 1 + 3 + 0 + 4 + 1 + 4 + 1 + 1 =27 PTS

DOUBLE WORD → 54TRIPLE WORD → 81

MEANING

What does prothetic vowel mean?