n. In archœol., a bracelet or armlet: as, a Roman or Frankish armilla. Also called armil.n. In machinery, an iron ring, hoop, or brace, in which the gudgeons of a wheel move.n. In anatomy, the annular ligament of the wrist which binds together the tendons of the hand.n. Same as armil, 1.n. In ornithology, a colored ring encircling the tibia of a bird just above the heel-joint.n. In botany, the frill originally covering the hymenium of agarics and adhering to the stipe after the expansion of the pileus.