1. Large balls or rolls of dark cloud which frequently cover the whole sky, esp. in winter, and give it at times an undulated appearance

Encyclopedia: Stratocumulus

• sinus paranasales
• sinus rectus
• sinus sigmoideus
• sinus transversus
• sinus venosus sclerae
• sinusitis
• sinusoid
• sinusoidal
• sinusoidal projection
• sinusoidally
• Sion
• Siouan
• Siouan language
• Siouan-speaking
• Sioux
• Sioux City
• Sioux Falls
• sip
• Sipah-e-Sahaba
• siphon
• siphon off
• Siphonaptera
• Siphonophora
• siphonophore
• SIPP