eutektoidse koostise omast väiksema teise komponendi sisaldusega tasakaaluolekus mikrostruktuuris eutektodi sisaldav sulam (vrd eutektoidsulam, üleeutektoidsulam), an alloy system exibiting a eutectoid; any alloy whose composition has an excess of base metal compared with the eutectoid composition and whose equilibrium microstrucrure contains some eutectoid structure (compare: eutectoid alloy, hypereutectoid alloy)