1. Inability to produce hybrids that are both viable and fertile

Type of: infertility, sterility

• sildenafil citrate
• silence
• silenced
• silencer
• silene
• Silene acaulis
• Silene caroliniana
• Silene dioica
• Silene latifolia
• Silene uniflora
• Silene virginica
• Silene vulgaris
• silent
• silent butler
• silent movie
• silent partner
• silent person
• silent picture
• silent treatment
• silently
• silents
• silenus
• silesia
• silex
• silhouette