Noun

• S: (n) medium (a means or instrumentality for storing or communicating information)
• S: (n) medium (the surrounding environment)
• S: (n) medium (an intervening substance through which signals can travel as a means for communication)
• S: (n) culture medium, medium ((bacteriology) a nutrient substance (solid or liquid) that is used to cultivate micro-organisms)
• S: (n) medium (a liquid with which pigment is mixed by a painter)
• S: (n) medium ((biology) a substance in which specimens are preserved or displayed)
• direct hyponym / full hyponym
• S: (n) contrast medium, contrast material (a substance that is opaque to x-rays; when administered it allows a radiologist to examine the organ or tissue it fills)
• domain category
• direct hypernym / inherited hypernym / sister term
• S: (n) substance (the real physical matter of which a person or thing consists)
• S: (n) matter (that which has mass and occupies space)
• S: (n) physical entity (an entity that has physical existence)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• S: (n) part, portion, component part, component, constituent (something determined in relation to something that includes it)
• S: (n) relation (an abstraction belonging to or characteristic of two entities or parts together)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• S: (n) medium (an intervening substance through which something is achieved)
• S: (n) medium (a state that is intermediate between extremes; a middle position)
• S: (n) medium, spiritualist, sensitive (someone who serves as an intermediary between the living and the dead)
• S: (n) medium, mass medium ((usually plural) transmissions that are disseminated widely to the public)
• S: (n) metier, medium (an occupation for which you are especially well suited)

Adjective

• S: (adj) average, intermediate, medium (around the middle of a scale of evaluation)
• S: (adj) medium ((meat) cooked until there is just a little pink meat inside)