♦ Radius: English meaning: a line segment extending from the center of a circle or sphere to the circumference or bounding surface. Bangla meaning: ব্যাসার্ধ। Plural form: Radii/ radiuses.
• কিছু কিছু noun এর plural অনিয়মিতভাবে হয়ে থাকে। যেমন:
• Singular: plural - Agendum: Agenda - Crisis: Crises - Radius: Radii - Thesis: Theses - Medium: Media etc.
Source: A Passage to the English Language by S.M. Zakir Hussain and Oxford Dictionary.