"TrimesterPTNICHD" . "Trimester"^^ . . . "A period of three months; especially one of the three three-month periods into which human pregnancy is divided.NCI" . "Trimester"^^ . "Trimester"^^ . "NICHD"^^ . "C69121"^^ . . . "Temporal Concept"^^ . "C0032982"^^ . "TrimesterPTNCI" . . . .