介卵 is read as かいらん (kairan) and means brooding.
かいらん
kairan
かい
shellfish
かいにゅう
intervention
かいじょ
help
かいざい
existing (between)
かいする
to use as an intermediary
かいして
through the medium of
かいにゅうけんきゅう
intervention study (epidemiology)
かいい
worrying about
かいびょう
nursing a patient
かいざいはいれつ
intron
かいおん
medial
かいす