Everett Lloyd Kayhart, 53, director of studies at Sidwell Friends School here and a longtime resident of Loudoun County, where he raised award-winning Arabian horses, died of cancer May 9 at his home in Lovettsville.

Mr. Kayhart, who also served as a college graduate counselor, joined Sidwell Friends in 1966.

In the late 1950s, he and a friend, George Engle, purchased the 22-acre Stonebrook Farm in Loudoun County. Six years later, a major Arabian horse breeder presented them with a mare in foal and the two men began breeding Arabians on a small scale, mostly as a "hobby business." Their horses took first class prizes at the East Coast Arabian Amateur Show, as well as at other East Coast shows, and in Howard County, Md. After Mr. Kayhart became ill, most of the horses were moved to an Arabian horse farm in Florida.

Mr. Kayhart was born in Lincoln Park, N.J. He graduated with high honors from the U.S. Merchant Marine Academy in 1949 and received a scholarship to Georgetown University's School of Foreign Service, from which he also graduated.

Before moving to this area, he served as junior officer on the SS America and SS United States and worked in his parents' orange groves in Florida for several years. Earlier, he saw duty with the Merchant Marine in Mediterranean, South American and European ports.

Survivors include his mother, Irma Mae Kayhart, and a sister, Dorothy Meyer, both of Fairfield, Pa.