sān​tǐ

trisomy

三体 三體 sān​tǐ
trisomy
a genetic condition where there are three copies of a particular chromosome instead of the usual two
trimer
a molecule or polymer formed from three smaller, identical molecules; a group of three components
three-body
relating to the three-body problem in physics, which involves predicting the motion of three point masses under their mutual gravitational force