a laboratory test of a new drug or a new invasive medical device on animal subjects; conducted to gather evidence justifying a clinical trial
of or relating to the early phases of a disease when accurate diagnosis is not possible because symptoms of the disease have not yet appeared
the act or instance of a planned discontinuation
any distinct time period in a sequence of events
(physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary
a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
(astronomy) the particular appearance of a body's state of illumination (especially one of the recurring shapes of the part of Earth's moon that is illuminated by the sun)
adjust so as to be in a synchronized condition
arrange in phases or stages
