1. Thin in diameter; resembling a thread
   - filamentous, filiform, threadlike, thready

See also: thin

• smooth plane
• smooth snake
• smooth softshell
• smooth sumac
• smooth winterberry holly
• smooth woodsia
• smooth-bodied
• smooth-faced
• smooth-haired
• smooth-haired fox terrier
• smooth-leaved elm
• smooth-shaven
• smooth-shelled
• smooth-skinned
• smooth-spoken
• smooth-textured
• smooth-tongued
• smoothbark
• smoothbore
• smoothed
• smoothen
• smoothened
• smoother
• smoothhound
• smoothhound shark