"a time period of 30 years"
"hastened the period of time of his recovery"
"Picasso's blue period"
"ganoid fishes swarmed during the earlier geological periods"
"death put a period to his endeavors"
"a change soon put a period to my tranquility"
"the women were sickly and subject to excessive menstruation"
"a woman does not take the gout unless her menses be stopped"
"the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"
"in England they call a period a stop"