infrasonic

ADJECTIVE /,ɪnfrə'sɑnɪk/
10 LETTERS · 4 SYLLABLES · STARTS WITH I

infrasonic is a valid 10-letter word worth 15 points in Scrabble and 18 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
I1N1F4R1A1S1O1N1I1C3
1 + 1 + 4 + 1 + 1 + 1 + 1 + 1 + 1 + 3 =15 PTS
DOUBLE WORD → 30TRIPLE WORD → 45
MEANING

What does infrasonic mean?

ADJECTIVE · 1 SENSE
1

Having frequencies below those of audible sound.