Mark Anderson scored 21 points, Kaleb Tarczewski had 16 points and 13 rebounds, and No. 18
Playing their first game without star freshman Allonzo Trier (hand), the Wildcats (14-3, 2-2
Arizona had a 43-26 advantage on the glass against the Pac-12's top rebounding team and shot 60% to extend its home winning streak to a nation-best 48 games.
Arizona's Parker Jackson-Cartwright had 11 assists with one turnover and Kadeem Allen scored 13 points.
Washington (11-5, 3-1) was no match for the beefier Wildcats inside. Noah Dickerson had 17 points and Marquese Chriss 13 for the Huskies, but Andrew Andrews, the Pac-12's leading scorer, battled foul trouble and scored only nine points on 3-of-11 shooting.
Ike Iroegbu led the Cougars (9-7, 1-3) with 18 points and Josh Hawkinson, the Pac-12's leading rebounder, added 15 points and 12 rebounds after being saddled with three fouls in the first half. Washington State has lost five of its last seven games.