Systemic⭐⭐⭐ Very Common
Dehydration
/dee-hye-DRAY-shuhn/Simple Meaning:
Too little fluid or water in the body.
Negative fluid balance leading to cellular extracellular volume depletion, hypernatremia, reduced skin turgor, and dry mucous membranes.
Clinical & Layman Language Dictionary (Deduplicated A–Z)
Medical Terms & Simple Meanings A–Z
Search over 153+ verified medical terms. Clear layman definitions, clinical explanations, frequency ratings (⭐⭐⭐ Very Common), pronunciations, and body system tags.
Showing 9 Medical Terms (Letter "D")Reset Filters
Neurological⭐⭐ Common
Delirium
/dih-LEER-ee-uhm/Simple Meaning:
Sudden, acute disturbance in attention and awareness.
Fluctuating organic mental syndrome involving acute cognitive dysfunction, sleep-wake cycle alteration, and visual hallucinations.
Systemic⭐⭐ Common
Diaphoresis
/dye-uh-fuh-REE-sis/Simple Meaning:
Medical term for excessive, unprovoked sweating.
Profuse sweating triggered by sympathetic nervous system stimulation, associated with acute MI, severe pain, or hypoglycemia.
Gastrointestinal⭐⭐⭐ Very Common
Diarrhea
/dye-uh-REE-uh/Simple Meaning:
Frequent loose or watery bowel movements.
Passage of 3 or more loose or watery stools daily, caused by gastroenteritis, secretory toxins, or malabsorption.
Neurological⭐⭐ Common
Diplopia
/dih-PLOH-pee-uh/Simple Meaning:
Medical term for double vision.
Perception of a single object as two images, resulting from extraocular muscle imbalance, cranial nerve palsies, or corneal opacity.
Neurological⭐⭐ Common
Disorientation
/dis-or-ee-uhn-TAY-shuhn/Simple Meaning:
Difficulty knowing time, place, or personal identity.
Impairment in cognitive orientation regarding time, space, or person, indicative of acute encephalopathy or delirium.
Neurological⭐⭐⭐ Very Common
Dizziness
/DIZ-ee-nis/Simple Meaning:
Feeling unsteady, lightheaded, or faint.
Nonspecific sensation of impaired spatial orientation, faintness, or presyncope.
Neurological⭐⭐⭐ Very Common
Drowsiness
/DROW-zee-nis/Simple Meaning:
Unusual sleepiness or inclination to sleep.
State of somnolence or impaired wakefulness due to sedative medications, sleep deprivation, or central metabolic disorders.
Respiratory⭐⭐⭐ Very Common
Dyspnea
/DISP-nee-uh/Simple Meaning:
Medical term for difficult or uncomfortable breathing.
Subjective experience of breathing discomfort consisting of qualitatively distinct sensations of air hunger and chest tightness.
This information is educational only and does not replace professional medical advice.