除霜 is read as じょそう (josou) and means defrosting.
じょそう
josou
しもよけ
covering which protects against frost
じょまくしき
unveiling ceremony
じょたい
military discharge
じょきん
disinfection
じょひょう
deleted residence record
じょかく
enucleate
じょさいどうき
defibrillator
じょせん
decontamination (e.g. from chemical or radioactive contamination)
じょまく
unveiling (a statue, monument, etc.)
じょさい
warding off calamities
じょせききかん
(time limit imposed by the) statute of limitations
じょきゃく
exclusion