selective
selenium
self-acting
self-agglomerating
self-annealing
self-baking
self-cleaning
self-contained
self-deoxidation
self-discharging
  self-driven
self-fluxing
self-hardening
self-ignition
self-propelled
self-propelling
self-supporting-type
self-tempering
selvage
semiacid
semiautomatic