乳清 is read as にゅうせい (nyuusei) and means whey.
にゅうせい
nyuusei
にゅうぼ
wet nurse
ちち
breast
にゅうぎゅう
dairy cow
ちくび
nipple
にゅうじ
infant (below 1 year old)
うば
にゅうようじ
infants
にゅうぎょう
dairy industry
めのと
にゅうとう
(mammary) nipple
にゅうえき
latex (milky fluid found in plants)
にゅうかじゅうごう
emulsion polymerization