a. [ L. Cadmeus, Gr. Kadmei^os, from Ka`dmos (L. Cadmus), which name perhaps means lit. a man from the East; cf. Heb. qedem east. ] Of or pertaining to Cadmus, a fabulous prince of Thebes, who was said to have introduced into Greece the sixteen simple letters of the alphabet -- α, β, γ, δ, ε, ι, κ, λ, μ, ν, ο, π, ρ, σ, τ, υ. These are called Cadmean letters. [ 1913 Webster ]

Cadmean victory, a victory that damages the victors as much as the vanquished; probably referring to the battle in which the soldiers who sprang from the dragon's teeth sown by Cadmus slew each other. Similar to a Pyhrric victory. [ 1913 Webster +PJC ]