1. A northern constellation, representing a figure grasping an encircling serpent.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• iphiuchus,
• kphiuchus,
• lphiuchus,
• pphiuchus,
• 0phiuchus,
• 9phiuchus,
• oohiuchus,
• olhiuchus,
• o-hiuchus,
• o0hiuchus,
• opgiuchus,
• opbiuchus,
• opniuchus,
• ophiucus,
• Ophinicus,
• oficous,
• Ophiochus,
• Ofiuchus,
• Ophochus,
• Ophiuscus

The adjective form of the word "Ophiuchus" is "Ophiuchean".

The plural form of the word "ophiuchus" is also "ophiuchus" as it is a singular noun without a specific plural form.

The singular form of the word "ophiuchus" is "ophiuchus" itself. It is the name of a constellation and does not have a distinct singular form.