agonist
definition: (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
example:
speech part: noun
synonyms:
definition: a muscle that contracts while another relaxes
example: when bending the elbow the biceps are the agonist
speech part: noun
synonyms:
definition: someone involved in a contest or battle (as in an agon)
example:
speech part: noun
synonyms:
definition: the principal character in a work of fiction
example:
speech part: noun
synonyms:
protagonist