test subject; participant in an experiment; testee; experimentee

testing on a living person

(pharmacology) new drug

to decide to do something: to do something on purpose / to perform a maneuver, to carry out a tactical action / to decide on an opinion: to believe in an opinion firmly

human body

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

experiment

to do an experiment