uto-aztecan

NOUN /jutoʊ_'æztɛkən/
11 LETTERS · 4 SYLLABLES · STARTS WITH U

uto-aztecan is a valid 11-letter word worth 21 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
U1T1O1-0A1Z10T1E1C3A1N1
1 + 1 + 1 + 0 + 1 + 10 + 1 + 1 + 3 + 1 + 1 =21 PTS
DOUBLE WORD → 42TRIPLE WORD → 63
MEANING

What does uto-aztecan mean?