preclinical

形容词 preclinical:

1. 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
   同义词：presymptomatic

pre.clin.i.cal

adj.（形容词）
Of or relating to the period of a disease before the appearance of symptoms.
临床前的：疾病症状出现前的时期的或与之相关的