noun, plural hypothalami [hahy-puh-thal-uh-mahy] . Anatomy.
a region of the brain, between the thalamus and the midbrain, that functions as the main control center for the autonomic nervous system by regulating sleep cycles, body temperature, appetite, etc., and that acts as an endocrine gland by producing hormones, including the releasing factors that control the hormonal secretions of the pituitary gland.

1895–1900; < Neo-Latin; see hypo-, thalamus

hypothalamic [hahy-poh-thuh-lam-ik, hip-oh-] , adjective
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World English Dictionary
hypothalamus (ˌhaɪpəˈθæləməs)
n , pl -mi
a neural control centre at the base of the brain, concerned with hunger, thirst, satiety, and other autonomic functions

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Word Origin & History

1896, coined 1893 in Ger. from Gk. hypo- "under" (see sub-) + thalamus "part of the brain where a nerve emerges."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hypothalamus hy·po·thal·a·mus (hī'pō-thāl'ə-məs)
The part of the brain that lies below the thalamus, forming the major portion of the ventral region of the diencephalon, and that regulates bodily temperature, certain metabolic processes, and other autonomic activities.

hy'po·tha·lam'ic (-thə-lām'ĭk) adj.
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American Heritage
Science Dictionary
hypothalamus   (hī'pō-thāl'ə-məs)  Pronunciation Key 
The part of the brain in vertebrate animals that lies below the thalamus and cerebrum. The hypothalamus controls the autonomic nervous system and the secretion of hormones by the pituitary gland. Through these nerve and hormone channels, the hypothalamus regulates many vital biological processes, including body temperature, blood pressure, thirst, hunger, and the sleep-wake cycle.
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American Heritage
Cultural Dictionary
hypothalamus [(heye-puh-thal-uh-muhs)]

The part of the brain that controls hunger, thirst, and body temperature and regulates various activities in the body connected with metabolism, including the maintaining of water balance. The hypothalamus also controls the action of the pituitary gland.

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Example sentences
It bulges out from the hypothalamus and fills much of the neighboring cavity.
Some of the main parts are the hippocampus, the amygdala, the thalamus and the
The hypothalamus controls hormone secretions from the nearby pituitary gland.
The signals are received in a structure at the base of the brain called the
Image for hypothalamus
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