Exam: GRE (Verbal)

Definition: A system of governance where five leaders or governments share power and rule together.

Example: The pentarchy was established to ensure that no single ruler could dominate the others.

Definition: Describing a chemical element or compound that has five bonds or valences.

Example: The pentavalent compound can form five different connections with other atoms.

Definition: A type of organic compound that consists of five carbon atoms and contains one double bond between carbon atoms.

Example: Pentene is commonly used in the production of plastics and other chemicals.

Definition: A type of medication that acts as a sedative and is used to help with sleep or to relax patients before surgery.

Example: The doctor prescribed pentobarbital to help the patient sleep before the procedure.

Definition: A type of electronic device that controls the flow of electricity, consisting of five electrodes, and is used in audio and radio equipment.

Example: The engineer replaced the old tube with a new pentode to improve the sound quality of the amplifier.

Definition: A type of simple sugar that has five carbon atoms in its structure, including sugars like ribose.

Example: Ribose is an important pentose sugar found in RNA.

Definition: A chemical compound that consists of five oxygen atoms bonded to another element or group.

Example: Pentoxide is often used in various chemical reactions and processes.

Definition: The item or syllable that comes just before the last one in a sequence.

Example: In the word 'banana', the penult is 'na'.

Definition: The second to last syllable in a word or the second to last item in a series.

Example: In the word 'banana', the penultima is 'na'.

Definition: Referring to the second to last item in a sequence or list.

Example: In a race with ten runners, the penultimate runner finished just before the last one.

Definition: The one that comes just before the last in a sequence.

Example: In a race with ten runners, the penultimate runner finished just before the last one.