Etymology
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gland (n.)

1690s, from French glande (Old French glandre "a gland," 13c.), from Latin glandula "gland of the throat, tonsil," diminutive of glans (genitive glandis) "acorn, nut; acorn-shaped ball," from PIE root *gwele- (2) "acorn" (source also of Greek balanos, Armenian kalin, Old Church Slavonic zelodi "acorn;" Lithuanian gilė "acorn"). Earlier English form was glandula (c. 1400); Middle English also had glandele "inflamed gland" (c. 1400). Extended from tonsils to glands generally.

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duct (n.)

1640s, "course, direction," from Latin ductus "a leading, a conduit pipe," noun use of past participle of ducere "to lead" (from PIE root *deuk- "to lead"). Anatomical sense "vessel of an animal body by which blood, lymph, etc., are conveyed" is from 1660s. Meaning "conduit, channel" is 1713; that of "air tube in a structure" is from 1884.

Duct tape originally was duck tape (1894), long, non-adhesive strips of plain cotton duck cloth used in various mechanical processes; from duck (n.2). The name was transferred to a plastic-coated adhesive tape used by U.S. soldiers in World War II (perhaps in part because it was waterproof). It continued in civilian use after the war, and the name shifted to duct tape by 1958, perhaps because it was frequently used on air ducts, which also accounts for its standard silver-gray color. 

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Cowper's gland (n.)

1738, so called because discovered by English anatomist William Cowper (1666-1709); for the surname see Cooper.

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lymphadenopathy (n.)

1899, from lymphadeno- "pertaining to a lymph gland" (from lymph + Greek adēnos, genitive of adēn "gland") + -pathy. Lymphadenoma is from 1870.

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adenoidal (adj.)

1852, "gland-like, resembling a gland," from adenoid + -al (1). From 1919 as "having the appearance of one with adenoids."

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thymus (n.)

gland near the base of the neck, 1690s, Modern Latin, from Greek thymos "a warty excrescence," used of the gland by Galen, literally "thyme," probably so called because of a fancied resemblance to a bud of thyme (see thyme). Related: Thymic.

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glandular (adj.)

1740, from French glandulaire, from glandule "small gland" (16c.), from Latin glandula (see gland). Earlier was glandelous (late 14c.), from Latin glandulosus.

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glanders (n.)

"horse disease characterized by glandular swelling," early 15c., from Old French glandres "swollen glands," plural of glandre "gland," from Latin glandula (see gland).

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adenoid (adj.)

1839, "gland-like," from medical Latin adenoideus, from Greek adenoeides, from adēn (genitive adēnos) "gland" (see adeno-) + eidos "form" (see -oid). Adenoids (n.) "adenoid growths" is attested by 1856.

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ureter (n.)

1570s, from medical Latin ureter, from Greek oureter "urinary duct of the kidneys," from ourein "to urinate," from ouron (see urine). Related: Ureteral.

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