syn- /sin-/, sy- /si-/, syl- /sil-/, sym- /sim-/ or sys- /sis-/

Signifying together, with

syn.

1. Synonym
2. Synthetic

• under seal
• underseal
• undersealed
• under sealed orders
• undersealing
• undersealings
• underseals
• under-secretaries
• under-secretary
• under-secretaryship
• under-secretaryships
• underself
• undersell
• underseller
• undersellers
• underselling
• undersells
• underselves
• undersense
• undersenses
• under separate cover
• underserved
• underset
• undersets
• undersetting