a. [ L. homotonus, Gr. &unr_;; &unr_; the same + &unr_; tone. ] Of the same tenor or tone; equable; without variation.
n. [ Etymol. uncertain. ] (Anc. Armor) A small plate covering the armpit in armor of the 14th century and later. [ 1913 Webster ]
n. [ NL.; thermo- + tonus. ] (Plant Physiol.) A condition of tonicity with respect to temperature. [ Webster 1913 Suppl. ]