Definition: A substance that has no therapeutic effect, often used in experiments to test the effectiveness of a real drug by comparing results.

Example: The doctor gave her a placebo to see if her symptoms would improve without actual medication.

Definition: An organ in female mammals that forms during pregnancy, connecting the mother to the developing fetus and providing nutrients and oxygen through the umbilical cord.

Example: The doctor explained how the placenta nourishes the baby during pregnancy.

Definition: Relating to or having a placenta, which is an organ that develops in the uterus during pregnancy to provide nutrients and oxygen to a developing baby.

Example: Humans are classified as placental mammals because they give birth to live young that are nourished before birth through a placenta.

Definition: A type of mammal that gives birth to live young that have developed inside the mother's body, connected to her by a special organ called the placenta.

Example: Humans are classified as placental mammals because they give birth to fully developed babies.

Definition: A serious disease that can spread quickly and cause many deaths, or a situation that causes a lot of trouble or annoyance.

Example: The city faced a plague that affected thousands of people.

Definition: To cause someone to suffer from a disease or to annoy someone repeatedly.

Example: The constant noise from the construction site plagued the residents for months.

Definition: In a manner that is annoying or troublesome.

Example: The constant noise from the construction site plaguily interrupted my concentration.

Definition: Causing annoyance or trouble; irritating.

Example: The plaguy noise from the construction site made it hard to concentrate.

Definition: A substance used for coating walls or ceilings, often made of lime, gypsum, or cement, that hardens when dry.

Example: The workers applied a fresh layer of plaister to the walls before painting.

Definition: Relating to the bottom part of the foot.

Example: He has a plantar wart that is causing him discomfort.

Definition: A flat, often decorative plate or disk that can be engraved or used for information, or a buildup of substances like bacteria on a surface, especially on teeth.

Example: The dentist removed the plaque from my teeth during the check-up.

Definition: A medical procedure that involves removing plasma from a person's blood and returning the other parts, like red blood cells, back to them.

Example: The doctor recommended plasmapheresis to help treat the patient's autoimmune disorder.