| reticence | (noun) the trait of being uncommunicative; not volunteering anything more than necessary | Synonyms: reserve, taciturnity |
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| 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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| reticulation | (noun) an arrangement resembling a net or network | - |
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| (noun) (photography) the formation of a network of cracks or wrinkles in a photographic emulsion | - |
| reticule | (noun) a woman's drawstring handbag; usually made of net or beading or brocade; used in 18th and 19th centuries | - |
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| (noun) a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument | Synonyms: graticule, reticle |
| reticulocyte | (noun) an immature red blood cell containing a network of filaments or granules | - |
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| reticulum | (noun) the second compartment of the stomach of a ruminant | Synonyms: second stomach |
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| (noun) any fine network (especially one in the body composed of cells or blood vessels) | - |
| retina | (noun) the innermost light-sensitive membrane covering the back wall of the eyeball; it is continuous with the optic nerve | - |
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| retinal | (noun) either of two yellow to red retinal pigments formed from rhodopsin by the action of light | Synonyms: retinene |
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| retinene | (noun) either of two yellow to red retinal pigments formed from rhodopsin by the action of light | Synonyms: retinal |
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| retinitis | (noun) inflammation of the retina | - |
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| retinoblastoma | (noun) malignant ocular tumor of retinal cells; usually occurs before the third year of life; composed of primitive small round retinal cells | - |
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| retinol | (noun) an unsaturated alcohol that occurs in marine fish-liver oils and is synthesized biologically from carotene | Synonyms: vitamin A1 |
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| retinopathy | (noun) a disease of the retina that can result in loss of vision | - |
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| retinue | (noun) the group following and attending to some important person | Synonyms: cortege, entourage, suite |
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| retiree | (noun) someone who has retired from active working | Synonyms: retired person |
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| retirement | (noun) withdrawal from your position or occupation | - |
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| (noun) withdrawal for prayer and study and meditation | Synonyms: retreat |
| (noun) the state of being retired from one's business or occupation | - |