Definition: Referring to the period before symptoms of a disease appear, making it difficult to diagnose accurately.

Example: The presymptomatic phase of the illness can last for several days, during which the person may not feel unwell.

Definition: Referring to the part of a nerve cell that sends signals to another cell at a synapse, occurring before the signal is transmitted.

Example: The presynaptic neuron releases neurotransmitters into the synaptic cleft.

Definition: In a way that relates to the presynaptic part of a neuron, which is the area before a synapse where signals are transmitted.

Example: The neurotransmitter is released presynaptically to communicate with the next neuron.

Definition: Happening or being born before the usual or expected time, especially in relation to pregnancy.

Example: The hospital has a special unit for caring for preterm infants.

Definition: A baby that is born before the usual time, specifically before 37 weeks of pregnancy have passed.

Example: The hospital has a special unit for caring for preterm infants.

Definition: Relating to a time or condition that occurs before the final stage or end of something.

Example: The preterminal phase of the project requires careful planning to ensure success.

Definition: Relating to something that is beyond what is normal or natural; extraordinary or supernatural.

Example: The magician's preternatural skills amazed the audience.

Definition: To apply a treatment to something before it is used or processed further.

Example: Before painting, you should pretreat the wood to ensure better adhesion of the paint.

Definition: Describing something that has undergone a preliminary treatment before the main process or use.

Example: The pretreated fabric is ready for dyeing.

Definition: To have treated something in advance before the main treatment or process.

Example: The fabric was pretreated to ensure better dye absorption.

Definition: A process or treatment that is done before another treatment or procedure.

Example: The water undergoes a pretreatment to remove impurities before it is purified.

Definition: The total number of cases of a particular condition or disease in a specific population at a certain time.

Example: The prevalence of diabetes has increased in recent years.