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annals a journal that contains the periodic formal reports of an organization. [1/3 definitions]
antiperiodic preventing the periodic recurrence of disease such as malaria. [2 definitions]
aperiodic occurring without regular intervals or cycles; not periodic.
atomic number the factor that determines the relative position of an element in the periodic table. [1/2 definitions]
bank statement a document that shows all the transactions that have occurred during a specific period of time in a bank account, esp. a periodic statement compiled by a bank for an account holder.
break up to lighten (something intense or monotonous) by means of periodic breaks or shifts in activity or mood. [1/10 definitions]
census an official count and statistical survey of a population, usu. conducted at periodic intervals.
diabetes any of several metabolic diseases affecting the body's use of blood sugars or the intake and excretion of fluids, such as diabetes mellitus, which requires periodic injections of insulin.
dipsomania an uncontrollable, usu. periodic craving for alcoholic drink.
feast (often cap.) a periodic event or occasion, esp. a religious festival, commemorating some person or occurrence, such as a saint's day. [1/6 definitions]
feast day (often cap.) a periodic commemorative event or occasion, esp. a religious festival celebrating a saint or holy occurrence.
land contract a real estate contract in which the buyer agrees to make periodic payments to the seller, taking title only when the purchase price has been paid in full.
manic-depressive denoting or suffering from a psychological disorder characterized by periodic alternation between high excitement and severe depression. [1/2 definitions]
menses (used with a sing. or pl. verb) the periodic discharge of blood, mucus, and cells built up in the mammalian uterus in preparation to receive an embryo and discarded when fertilization of the egg has not taken place.
menstruation the usu. periodic process of discharging blood, mucus, and dead cells from the mammalian uterus when the egg is not fertilized. [1/2 definitions]
molt to shed or cast off an outer layer, such as skin, feathers, fur, or horns, as part of a periodic process of renewal. [1/4 definitions]
periodical periodic. [1/3 definitions]
periodicity in chemistry, the similarity of properties among elements that occupy similar positions in the periodic table. [1/2 definitions]
periodic system a system of classifying the chemical elements, based on the periodic law.
periodic table a table that illustrates the periodic system of the chemical elements, classified according to atomic number.
pulse1 the periodic throbbing of arteries that results from the beating of the heart, esp. as felt in the wrist or neck. [2/5 definitions]