Thyroid Thy"roid, a. [Gr. qyreoeidh`s shield-shaped; qyreo`s a large, oblong shield (from qy`ra a door) + e'i^dos form: cf. F. thyro["i]de, thyr['e]o["i]de.] 1. Shaped like an oblong shield; shield-shaped; as, the thyroid cartilage. [1913 Webster]

2. (Anat.) Of or pertaining to the thyroid body, thyroid cartilage, or thyroid artery; thyroideal. [1913 Webster]

{Thyroid cartilage}. See under {Larynx}.

{Thyroid body}, or {Thyroid gland} (Anat.), an endocrine gland having two lobes, located in the floor of the mouth or the region of the larynx, which secretes two hormones ({thyroxine} and {triiodothyronine}) that regulate the rates of growth and metabloism. In man and most mammals it is a highly vascular organ, partly surrounding the base of the larynx and the upper part of the trachea. Cases of hypothyroidism, where the gland is insufficiently active, can be treated by administration of thyroxine or a combination of thyroxine and triiodothyronine.

{Thyroid dislocation} (Surg.), dislocation of the thigh bone into the thyroid foramen.

{Thyroid foramen}, the obturator foramen. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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Look at other dictionaries:

  • thyroid — UK [ˈθaɪrɔɪd] / US [ˈθaɪˌrɔɪd] or thyroid gland UK / US noun [countable] Word forms thyroid : singular thyroid plural thyroids Word forms thyroid gland : singular thyroid gland plural thyroid glands medical an organ in your neck that produces… …   English dictionary

  • thyroid — [thī′roid΄] adj. [ModL thyroides < Gr thyreoeidēs, shield shaped < thyreos, large shield, door shaped shield < thyra,DOOR + eidēs, OID] 1. designating or of a large ductless gland lying in front and on either side of the trachea and… …   English World dictionary

  • thyroid — (adj.) 1690s (in reference to both the cartilage and the gland), from Gk. thyreoiedes shield shaped (in khondros thyreoiedes shield shaped cartilage, used by Galen to describe the Adam s apple in the throat), from thyreos oblong, door shaped… …   Etymology dictionary

  • thyroid — ► NOUN (also thyroid gland) ▪ a large gland in the neck which secretes hormones regulating growth and development through the rate of metabolism. ORIGIN from Greek khondros thureoeid s shield shaped cartilage …   English terms dictionary

  • Thyroid — Infobox Anatomy Name = Thyroid Latin = glandula thyroidea GraySubject = 272 GrayPage = 1269 Caption = Endocrine system Caption2 = Thyroid and parathyroid. Precursor = 4th Branchial pouch System = endocinal jubachina system Artery = superior… …   Wikipedia

  • Thyroid — An adjective and a noun, pertaining to the thyroid gland or, less often today, to a preparation made of mammalian thyroid tissue to treat hypothyroidism. For example, the sentence My thyroid is not making enough thyroid hormone uses thyroid… …   Medical dictionary

  • thyroid — I. adjective also thyroidal Etymology: New Latin thyroides, from Greek thyreoeidēs shield shaped, thyroid, from thyreos shield shaped like a door, from thyra door more at door Date: circa 1741 1. a. of, relating to, or being the thyroid gland b.… …   New Collegiate Dictionary

  • thyroid — thyroidal, adj. thyroidless, adj. /thuy royd/, adj. 1. of or pertaining to the thyroid gland. 2. of or pertaining to the largest cartilage of the larynx, forming the projection known in humans as the Adam s apple. n. 3. See thyroid gland. 4. the… …   Universalium

  • thyroid — /ˈθaɪrɔɪd / (say thuyroyd) adjective 1. denoting or relating to the thyroid gland. 2. denoting or relating to the principal cartilage of the larynx, forming the projection known in men as the Adam s apple. –noun 3. → thyroid gland. 4. the thyroid …  

  • thyroid — n. & adj. n. (in full thyroid gland) 1 a large ductless gland in the neck of vertebrates secreting a hormone which regulates growth and development through the rate of metabolism. 2 an extract prepared from the thyroid gland of animals and used… …   Useful english dictionary

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