| actinomyxidian | (noun) of or relating to parasites of worms | - |
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| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| comedian | (noun) a professional performer who tells jokes and performs comical acts | Synonyms: comic |
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| (noun) an actor in a comedy | - |
| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| custodianship | (noun) the position of custodian | - |
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| guardian | (noun) a person who cares for persons or property | Synonyms: defender, protector, shielder |
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| guardianship | (noun) the responsibility of a guardian or keeper | Synonyms: keeping, safekeeping |
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| (noun) attention and management implying responsibility for safety | Synonyms: care, charge, tutelage |
| haemosporidian | (noun) minute protozoans parasitic at some stage of the life cycle in blood cells of vertebrates including many pathogens | - |
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| haplosporidian | (noun) parasite in invertebrates and lower vertebrates of no known economic importance | - |
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| median | (noun) the number midway between the two middle numbers in a series containing an even or odd number of items | Synonyms: median value |
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| mediant | (noun) (music) the third note of a diatonic scale; midway between the tonic and the dominant | - |
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| meridian | (noun) an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator | Synonyms: line of longitude |
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| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, height, peak, pinnacle, summit, superlative, tiptop, top |
| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
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| microsporidian | (noun) parasite of arthropods and fishes that invade and destroy host cells | - |
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| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
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| myxosporidian | (noun) mostly parasitic in fishes and including various serious pathogens | - |
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| obsidian | (noun) acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces | - |
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| ophidian | (noun) limbless scaly elongate reptile; some are venomous | Synonyms: serpent, snake |
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| proboscidian | (noun) massive herbivorous mammals having tusks and a long trunk | Synonyms: proboscidean |
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| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
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| radiance | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiancy, refulgence, refulgency, shine |
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| (noun) the amount of electromagnetic radiation leaving or arriving at a point on a surface | Synonyms: glow, glowing |
| (noun) an attractive combination of good health and happiness | - |
| radiancy | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, refulgence, refulgency, shine |
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| sarcosporidian | (noun) parasite of the muscles of vertebrates | Synonyms: sarcocystidean, sarcocystieian |
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| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
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| submediant | (noun) (music) the sixth note of a major or minor scale (or the third below the tonic) | - |
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| tragedian | (noun) an actor who specializes in tragic roles | - |
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| (noun) a writer (especially a playwright) who writes tragedies | - |