| antheridium | (noun) the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers | - |
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| basidium | (noun) a small club-shaped structure typically bearing four basidiospores at the ends of minute projections; unique to basidiomycetes | - |
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| caladium | (noun) any plant of the genus Caladium cultivated for their ornamental foliage variously patterned in white or pink or red | - |
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| clostridium | (noun) spindle-shaped bacterial cell especially one swollen at the center by an endospore | Synonyms: clostridia |
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| coccidium | (noun) parasitic on the digestive epithelium of vertebrates and higher invertebrates | Synonyms: eimeria |
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| compendium | (noun) a concise but comprehensive summary of a larger work | - |
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| (noun) a publication containing a variety of works | Synonyms: collection |
| conidium | (noun) an asexually produced fungal spore formed on a conidiophore | Synonyms: conidiospore |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| cymbidium | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbid |
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| endocardium | (noun) the membrane that lines the cavities of the heart and forms part of the heart valves | - |
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| epicardium | (noun) the innermost of the two layers of the pericardium | Synonyms: visceral pericardium |
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| exordium | (noun) (rhetoric) the introductory section of an oration or discourse | - |
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| glochidium | (noun) a barbed spine or bristle (often tufted on cacti) | Synonyms: glochid |
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| hypobasidium | (noun) special cell constituting the base of the basidium in various fungi especially of the order Tremellales | - |
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| indium | (noun) a rare soft silvery metallic element; occurs in small quantities in sphalerite | Synonyms: atomic number 49, In |
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| iridium | (noun) a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium | Synonyms: atomic number 77, Ir |
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| medium | (noun) an occupation for which you are especially well suited | Synonyms: metier |
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| (noun) an intervening substance through which signals can travel as a means for communication | - |
| (noun) a means or instrumentality for storing or communicating information | - |
| (noun) (usually plural) transmissions that are disseminated widely to the public | Synonyms: mass medium |
| (noun) the surrounding environment | - |
| (noun) someone who serves as an intermediary between the living and the dead | Synonyms: sensitive, spiritualist |
| (noun) a state that is intermediate between extremes; a middle position | - |
| (noun) (bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms | Synonyms: culture medium |
| (noun) (biology) a substance in which specimens are preserved or displayed | - |
| (noun) a liquid with which pigment is mixed by a painter | - |
| (noun) an intervening substance through which something is achieved | - |
| myocardium | (noun) the middle muscular layer of the heart wall | - |
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| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
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| (noun) state of disgrace resulting from detestable behavior | - |
| ommatidium | (noun) any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods | - |
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| oncidium | (noun) any orchid of the genus Oncidium: characterized by slender branching sprays of small yellow and brown flowers; often grown as houseplants | Synonyms: butterfly orchid, butterfly plant, dancing lady orchid |
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| osmiridium | (noun) a hard and corrosion resistant mineral that is a natural alloy of osmium and iridium (usually containing small amounts of rhodium and platinum); used in needles and pen nibs etc. | Synonyms: iridosmine |
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| palladium | (noun) a silver-white metallic element of the platinum group that resembles platinum; occurs in some copper and nickel ores; does not tarnish at ordinary temperatures and is used (alloyed with gold) in jewelry | Synonyms: atomic number 46, Pd |
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| parapodium | (noun) one of a pair of fleshy appendages of a polychete annelid that functions in locomotion and breathing | - |
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| pericardium | (noun) a serous membrane with two layers that surrounds the heart | - |
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| peridium | (noun) outer layer of the spore-bearing organ in many fungi | - |
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| plasmodium | (noun) parasitic protozoan of the genus Plasmodium that causes malaria in humans | Synonyms: malaria parasite, Plasmodium vivax |
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| (noun) multinucleate sheet of cytoplasm characteristic of some stages of such organisms as slime molds | - |
| podium | (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, pulpit, rostrum, soapbox, stump |
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| praesidium | (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session | Synonyms: presidium |
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| precordium | (noun) the external surface of the body overlying the heart and stomach | - |
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| presidium | (noun) a permanent executive committee in socialist countries that has all the powers of some larger legislative body and that acts for it when it is not in session | Synonyms: praesidium |
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| primordium | (noun) an organ in its earliest stage of development; the foundation for subsequent development | Synonyms: anlage |
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| pseudopodium | (noun) temporary outgrowth used by some microorganisms as an organ of feeding or locomotion | Synonyms: pseudopod |
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| pycnidium | (noun) flask-shaped asexual structure containing conidia | - |
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| pyxidium | (noun) fruit of such plants as the plantain; a capsule whose upper part falls off when the seeds are released | Synonyms: pyxis |
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| radium | (noun) an intensely radioactive metallic element that occurs in minute amounts in uranium ores | Synonyms: atomic number 88, Ra |
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| regnellidium | (noun) small latex-containing aquatic fern of southern Brazil | Synonyms: Regnellidium diphyllum |
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| rhodium | (noun) a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum | Synonyms: atomic number 45, Rh |
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| rubidium | (noun) a soft silvery metallic element of the alkali metal group; burns in air and reacts violently in water; occurs in carnallite and lepidolite and pollucite | Synonyms: atomic number 37, Rb |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| scandium | (noun) a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite | Synonyms: atomic number 21, Sc |
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| sodium | (noun) a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds (especially in salt water); burns with a yellow flame and reacts violently in water; occurs in sea water and in the mineral halite (rock salt) | Synonyms: atomic number 11, Na |
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| stadium | (noun) a large structure for open-air sports or entertainments | Synonyms: arena, bowl, sports stadium |
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| stylopodium | (noun) an enlargement at the base of the style in some Umbelliferae | - |
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| tedium | (noun) dullness owing to length or slowness | Synonyms: tediousness, tiresomeness |
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| (noun) the feeling of being bored by something tedious | Synonyms: boredom, ennui |
| unnilquadium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, rutherfordium, Unq |
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| ununquadium | (noun) a radioactive transuranic element, with atomic number 114 | Synonyms: atomic number 114, element 114, Uuq |
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| vanadium | (noun) a soft silvery white toxic metallic element used in steel alloys; it occurs in several complex minerals including carnotite and vanadinite | Synonyms: atomic number 23, V |
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