栓子 is read as せんし (senshi) and means embolus.
せんし
senshi
せんぬき
bottle opener
せん
tap
とうがらし
shichimi pepper
なす
eggplant (Solanum melongena)
ようし
adopted child (usu. male)
ひょうし
the moment
しょうじ
shoji (paper sliding door)
せんす
folding fan
くじ
Confucius
やし
palm tree (any tree of family Arecaceae)
そりゅうし
elementary particle
いでんし
gene