Term: biological clock: an innate mechanism in living organisms that controls the periodicity of many physiological functions
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: vestibule of the vagina: the space between the labia minora containing the orifice of the urethra
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: stick horse: a child's plaything consisting on an imitation horse's head on one end of a stick
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: leaven: an influence that works subtly to lighten or modify something
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: genus ibis: ibises
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: factotum: a servant employed to do a variety of jobs
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: teaching method: the principles and methods of instruction
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: linen: a fabric woven with fibers from the flax plant
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: enamelware: cooking utensil of enameled iron
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: melolonthidae: considered a separate family in some classification systems
Broader: mechanism: a natural object resembling a machine in structure or function | Unrelated: pyrethrum: white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum