quad appears in definitions for these words:
Acnestis Agouty Ahuitzote Alco Allanite Altimeter Amphibial Amyztli Ant-bear Ant-eater Antelope Anthropolite Antimeter Ape Armadillo Ash Aspect Ass Attar Azerit Baboon Babyroussa Back Backstaff Badger Basto Bat Bearing-cloth Beaver Beeves Behemoth Biggel Bipinnatifid Bisdiapason Bison Bos Bovine Breast Buck Bull Calf Camel Cariboo Castor Cat Cattle Cavetto Cavy Class Coguar Complement Cony Coquallin Cow Cub Dam Deer Diagonal Dichotomy Disdiapason Dog Elephant Elk Ember Equator Family Fatling Fish Foal Forefoot Fourfold Fourfooted Foursquare Gallop Giraff Goat Graminivorous Granadilla Guinea-pig Hare Haunch Hedgehog Heel Herpetology Hexaped Hind Hoofed Horn Horse Hunt Hyena Jargon Jerboa Lemur Lent Leopard Life Limb Lion Litter Log Loris Lynx Macauco Mammoth Mare Marmot Matadore Megatherium Mink Mule Nose Nylgau Obelisk Once Opossum Ossivorous Ox Pachydermatous Panther Parallelogram Paunch Pec-cary Phasis Pizzle Platypus Point Polecat Porcupine Puma Quadragene Quadragesima Quadrangle Quadrant Quadrantal Quadrat Quadrate Quadratic Quadrature Quadrennial Quadrible Quadricapsular Quadridecimal Quadridentate Quadrifid Quadrijugous Quadrilateral Quadriliteral Quadrille Quadrilobate Quadrilocular Quadrin Quadrinomial Quadripartite Quadripartitely Quadriphyllous Quadrireme Quadrisyllable Quadrivalve Quadrivalvular Quadrivial Quadroon Quadruman Quadruped Quadruple Quadruplicate Quadruply Quarter Rabbit Racoon Rat Rennet Rhinoceros Rhoetizite Rhomboid Ring-streaked Ruminate Run Runnet Semi-quadrate Septuagesima Sextant Shoulder Side Sight Soliped Square Squirrel Subquadruple Suslik Swine Tail Tanrec Tapir Tardigrade Tetradiapason Tetragon Tetragonism Thigh Tooth Trot Udder Vari Variation Vertebrated Walk Water-hog Wood-shock Zizel