1. The quality of being infectious

Derived forms: infectiousnesses

• penny dreadful
• penny for your thoughts
• penny grass
• penny pincher
• penny stock
• penny-farthing
• penny-pinch
• penny-pinching
• penny-wise
• pennycress
• pennyroyal
• pennyroyal oil
• pennyweight
• pennywhistle
• pennywort
• pennyworth
• Penobscot
• Penobscot Bay
• Penobscot River
• penoche
• penological
• penologist
• penology
• penoncel
• penpusher