| adrenocorticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, corticotrophin, corticotropin |
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| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| breastpin | (noun) a decorative pin worn by women | Synonyms: broach, brooch |
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| candlepin | (noun) a bowling pin that is thin by comparison with a tenpin | - |
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| chincapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chinkapin, chinquapin |
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| chinkapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chincapin, chinquapin |
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| chinquapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chincapin, chinkapin |
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| (noun) shrubby chestnut tree of southeastern United States having small edible nuts | Synonyms: Allegheny chinkapin, Castanea pumila, dwarf chestnut, eastern chinquapin |
| (noun) shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States | Synonyms: Castanea ozarkensis, Ozark chinkapin, Ozark chinquapin |
| clothespin | (noun) wood or plastic fastener; for holding clothes on a clothesline | Synonyms: clothes peg, clothes pin |
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| corticotropin | (noun) a hormone produced by the anterior pituitary gland that stimulates the adrenal cortex | Synonyms: ACTH, adrenocorticotrophic hormone, adrenocorticotrophin, adrenocorticotropic hormone, adrenocorticotropin, corticotrophin |
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| downspin | (noun) a swift and dangerous downturn | - |
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| doxepin | (noun) a tricyclic antidepressant (trade names Adapin and Sinequan) with numerous side effects (dry mouth and sedation and gastrointestinal disturbances) | Synonyms: Adapin, doxepin hydrochloride, Sinequan |
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| duckpin | (noun) a bowling pin that is short and squat by comparison with a tenpin | - |
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| gonadotropin | (noun) hormone secreted by the anterior pituitary gland and placenta; stimulates the gonads and controls reproductive activity | Synonyms: gonadotrophic hormone, gonadotrophin, gonadotropic hormone |
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| hairpin | (noun) a double pronged pin used to hold women's hair in place | - |
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| hatpin | (noun) a long sturdy pin used by women to secure a hat to their hair | - |
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| headpin | (noun) the front bowling pin in the triangular arrangement of ten pins | Synonyms: kingpin |
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| kingpin | (noun) bolt that provides a steering joint in a motor vehicle | Synonyms: kingbolt, swivel pin |
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| (noun) the front bowling pin in the triangular arrangement of ten pins | Synonyms: headpin |
| (noun) the most important person in a group or undertaking | Synonyms: bigwig, top banana |
| lapin | (noun) castrated male rabbit | - |
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| (noun) the fur of a rabbit | Synonyms: rabbit |
| linchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: lynchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, lynchpin, mainstay |
| lupin | (noun) any plant of the genus Lupinus; bearing erect spikes of usually purplish-blue flowers | Synonyms: lupine |
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| luteotropin | (noun) gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition | Synonyms: lactogenic hormone, prolactin |
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| lynchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: linchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, linchpin, mainstay |
| ninepin | (noun) a bowling pin of the type used in playing ninepins or (in England) skittles | Synonyms: skittle, skittle pin |
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| orpin | (noun) perennial northern temperate plant with toothed leaves and heads of small purplish-white flowers | Synonyms: live-forever, livelong, orpine, Sedum telephium |
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| pin | (noun) a small slender (often pointed) piece of wood or metal used to support or fasten or attach things | - |
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| (noun) a piece of jewelry that is pinned onto the wearer's garment | - |
| (noun) axis consisting of a short shaft that supports something that turns | Synonyms: pivot |
| (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, rowlock, thole, tholepin |
| (noun) a club-shaped wooden object used in bowling; set up in triangular groups of ten as the target | Synonyms: bowling pin |
| (noun) flagpole used to mark the position of the hole on a golf green | Synonyms: flag |
| (noun) cylindrical tumblers consisting of two parts that are held in place by springs; when they are aligned with a key the bolt can be thrown | Synonyms: pin tumbler |
| (noun) informal terms for the leg | Synonyms: peg, stick |
| (noun) small markers inserted into a surface to mark scores or define locations etc. | Synonyms: peg |
| (noun) when a wrestler's shoulders are forced to the mat | Synonyms: fall |
| (verb) (chess) immobilize a piece | - |
| (verb) attach or fasten with pins | - |
| (verb) pierce with a pin | - |
| (verb) to hold fast or prevent from moving | Synonyms: immobilise, immobilize, trap |
| poppin | (adjective) Of an event that is taking place and is lively | - |
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| pushpin | (noun) a tack for attaching papers to a bulletin board or drawing board | Synonyms: drawing pin, thumbtack |
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| rifampin | (noun) an antibacterial drug (trade names Rifadin and Rimactane) used to treat tuberculosis | Synonyms: Rifadin, Rimactane |
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| scarfpin | (noun) a pin used to hold the tie in place | Synonyms: tie tack, tiepin |
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| sculpin | (noun) any of numerous spiny large-headed usually scaleless scorpaenoid fishes with broad mouths | - |
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| somatotropin | (noun) a hormone produced by the anterior pituitary gland; promotes growth in humans | Synonyms: growth hormone, human growth hormone, somatotrophic hormone, somatotrophin, somatotropic hormone, STH |
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| spin | (noun) the act of rotating rapidly | Synonyms: twirl, twist, twisting, whirl |
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| (noun) a short drive in a car | - |
| (noun) rapid descent of an aircraft in a steep spiral | Synonyms: tailspin |
| (noun) a distinctive interpretation (especially as used by politicians to sway public opinion) | - |
| (noun) a swift whirling motion (usually of a missile) | - |
| (verb) prolong or extend | Synonyms: spin out |
| (verb) twist and turn so as to give an intended interpretation | - |
| (verb) work natural fibers into a thread | - |
| (verb) form a web by making a thread | - |
| (verb) make up a story | - |
| (verb) stream in jets, of liquids | - |
| (verb) revolve quickly and repeatedly around one's own axis | Synonyms: gyrate, reel, spin around, whirl |
| (verb) cause to spin | Synonyms: birl, twirl, whirl |
| stickpin | (noun) a decorative pin that is worn in a necktie | - |
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| tailspin | (noun) rapid descent of an aircraft in a steep spiral | Synonyms: spin |
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| (noun) loss of emotional control often resulting in emotional collapse | - |
| tenpin | (noun) one of the bottle-shaped pins used in bowling | - |
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| terrapin | (noun) any of various edible North American web-footed turtles living in fresh or brackish water | - |
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| tholepin | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, pin, rowlock, thole |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| tiepin | (noun) a pin used to hold the tie in place | Synonyms: scarfpin, tie tack |
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| topspin | (noun) forward spin (usually of a moving ball) that is imparted by an upward stroke | - |
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| underpin | (verb) support from beneath | - |
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| (verb) support with evidence or authority or make more certain or confirm | Synonyms: bear out, corroborate, support |
| unpin | (verb) remove the pins from; unfasten the pins of | - |
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| yanquapin | (noun) water lily of eastern North America having pale yellow blossoms and edible globular nutlike seeds | Synonyms: American lotus, Nelumbo lutea, water chinquapin |
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