strep /stɹɛp/ noun3 •(informal) a round bacterium that grows in chains, with some kinds causing throat and skin infections, also called a streptococcus •(informal) a throat infection caused by streptococcus bacteria, with a very sore throat and often a feverSore throat is the telltale sign. About one in 10 adults with a sore throat has strep, according to the C.D.C. — 2023 •(informal) a flowering plant with long soft leaves and tube-shaped flowers, often grown in pots at home, also called a streptocarpus formsstreps