| reticle | (noun) a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument | Synonyms: graticule, reticule |
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| ribonuclease | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonucleinase, RNase |
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| ribonucleinase | (noun) a transferase that catalyzes the hydrolysis of ribonucleic acid | Synonyms: ribonuclease, RNase |
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| salesclerk | (noun) a salesperson in a store | Synonyms: clerk, shop assistant, shop clerk |
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| sanicle | (noun) a plant of the genus Sanicula having palmately compound leaves and unisexual flowers in panicled umbels followed by bristly fruit; reputed to have healing powers | Synonyms: snakeroot |
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| sclera | (noun) the whitish fibrous membrane (albuginea) that with the cornea forms the outer covering and protection of the eyeball | Synonyms: sclerotic coat |
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| scleredema | (noun) a skin disease marked by hard edema of the tissue usually beginning in the face | - |
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| sclerite | (noun) hard plate or element of the exoskeleton of some arthropods | - |
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| scleritis | (noun) inflammation of the sclera | - |
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| scleroderma | (noun) an autoimmune disease that affects the blood vessels and connective tissue; fibrous connective tissue is deposited in the skin | Synonyms: dermatosclerosis |
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| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| scleroprotein | (noun) a simple protein found in horny and cartilaginous tissues and in the lens of the eye | Synonyms: albuminoid |
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| sclerosed | (adjective) relating to or having sclerosis; hardened | Synonyms: sclerotic |
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| sclerosis | (noun) any pathological hardening or thickening of tissue | Synonyms: induration |
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| sclerotic | (adjective) of or relating to the sclera of the eyeball | - |
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| (adjective) relating to or having sclerosis; hardened | Synonyms: sclerosed |
| sclerotinia | (noun) any fungus of the genus Sclerotinia; some causing brown rot diseases in plants | - |
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| sclerotium | (noun) compact usually dark-colored mass of hardened mycelium constituting a vegetative food-storage body in various true fungi; detaches when mature and can give rise to new growth | - |
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| sclerotomy | (noun) surgical incision of the sclerotic coat of the eye | - |
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| semicircle | (noun) a plane figure with the shape of half a circle | Synonyms: hemicycle |
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| silicle | (noun) short broad silique occurring in some cruciferous plants | - |
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| socle | (noun) a plain plinth that supports a wall | - |
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| spectacle | (noun) a blunder that makes you look ridiculous; used in the phrase `make a spectacle of' yourself | - |
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| (noun) an elaborate and remarkable display on a lavish scale | - |
| (noun) something or someone seen (especially a notable or unusual sight) | - |
| spectacled | (adjective) wearing, or having the face adorned with, eyeglasses or an eyeglass | Synonyms: bespectacled, monocled |
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| spectacles | (noun) (plural) optical instrument consisting of a frame that holds a pair of lenses for correcting defective vision | Synonyms: eyeglasses, glasses, specs |
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| spiracle | (noun) a breathing orifice | - |
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| sternocleidomastoid | (noun) one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head | Synonyms: musculus sternocleidomastoideus, sternocleido mastoideus, sternocleidomastoid muscle |
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| tabernacle | (noun) (Judaism) the place of worship for a Jewish congregation | Synonyms: synagogue, temple |
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| tentacle | (noun) any of various elongated tactile or prehensile flexible organs that occur on the head or near the mouth in many animals; used for feeling or grasping or locomotion | - |
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| (noun) something that acts like a tentacle in its ability to grasp and hold | - |
| tentacled | (adjective) having tentacles | - |
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| testicle | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, bollock, egg, nut, orchis, testis |
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| thermonuclear | (adjective) using nuclear weapons based on fusion as distinguished from fission | - |
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| treacle | (noun) writing or music that is excessively sweet and sentimental | Synonyms: glop, mush, slop |
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| (noun) a pale cane syrup | Synonyms: golden syrup |
| tricycle | (noun) a vehicle with three wheels that is moved by foot pedals | Synonyms: trike, velocipede |
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| trinuclear | (adjective) having three nuclei | Synonyms: trinucleate, trinucleated |
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| trinucleate | (adjective) having three nuclei | Synonyms: trinuclear, trinucleated |
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| trinucleated | (adjective) having three nuclei | Synonyms: trinuclear, trinucleate |
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| tubercle | (noun) a protuberance on a bone especially for attachment of a muscle or ligament | Synonyms: eminence, tuberosity |
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| (noun) small rounded wartlike protuberance on a plant | Synonyms: nodule |
| (noun) a swelling that is the characteristic lesion of tuberculosis | - |
| uncle | (noun) the brother of your father or mother; the husband of your aunt | - |
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| (noun) a source of help and advice and encouragement | - |
| unclean | (adjective) having a physical or moral blemish so as to make impure according to dietary or ceremonial laws | Synonyms: impure |
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| (adjective) soiled or likely to soil with dirt or grime | Synonyms: dirty, soiled |
| uncleanliness | (noun) lack of cleanly habits | - |
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| uncleanly | (adjective) habitually unclean | - |
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| uncleanness | (noun) the state of being unsanitary | Synonyms: dirtiness |
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| unclear | (adjective) not clear to the mind | - |
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| (adjective) poorly stated or described | Synonyms: ill-defined |
| (adjective) not easily deciphered | Synonyms: indecipherable, undecipherable, unreadable |
| uncleared | (adjective) not cleared; not rid of objects or obstructions | - |
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| unclearly | (adverb) in a manner that is unclear | - |
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| unclearness | (noun) incomprehensibility as a result of not being clear | - |
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| unicycle | (noun) a vehicle with a single wheel that is driven by pedals | Synonyms: monocycle |
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| (verb) ride a unicycle | - |
| uninucleate | (adjective) having one nucleus | - |
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| upcycle | (verb) To transform an old product into a newer and more expensive form with a different use | - |
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| utricle | (noun) a small pouch into which the semicircular canals open | Synonyms: utriculus |
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| vehicle | (noun) a conveyance that transports people or objects | - |
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| (noun) a medium for the expression or achievement of something | - |
| (noun) any inanimate object (as a towel or money or clothing or dishes or books or toys etc.) that can transmit infectious agents from one person to another | Synonyms: fomite |
| (noun) any substance that facilitates the use of a drug or pigment or other material that is mixed with it | - |
| ventricle | (noun) a chamber of the heart that receives blood from an atrium and pumps it to the arteries | Synonyms: heart ventricle |
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| (noun) one of four connected cavities in the brain; is continuous with the central canal of the spinal cord and contains cerebrospinal fluid | - |
| versicle | (noun) a short verse said or sung by a priest or minister in public worship and followed by a response from the congregation | - |
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| vesicle | (noun) a small anatomically normal sac or bladderlike structure (especially one containing fluid) | Synonyms: cyst |
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