tricyclic

"The number three is written with the digit three. "

"The prisoners were kept in a secure compound. "

"I have a house and a car."

"The chemist carefully measured the ingredients for the baking soda volcano experiment in science class. "

"The scientist carefully examined the substance to determine its chemical composition. "

"The police identified the thief using security camera footage. "

" The laboratory tested the coal tar sample and found a high concentration of anthracene, a chemical used in making dyes. "

"The teacher's lesson was based on the students' prior knowledge of fractions. "

"After the fire, the family unknown the location of their cherished photos. "

"The two wires were fused together by the intense heat, making them impossible to separate. "

"She wore three silver rings on her left hand. "

"Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom and a chlorine atom."