引裂く[hikisaku] to tear up
核分裂[kakubunretsu] nuclear fission
裂く[saku] to tear
乾裂[kanretsu] cracks in drying lumber
き裂[kiretsu] crack

決裂[ketsuretsu] breakdown
四分五裂[shibungoretsu] torn asunder
支離滅裂[shirimetsuretsu] incoherent
精神分裂症[seishinbunretsushou] schizophrenia
切り細裂く[kirikomazaku] to cut up small

弁鰓類[bensairui] lamellibranches (i.e. bivalves)
鰓呼吸[erakokyuu] branchial respiration (breathing using gills)
鰓蓋[erabuta] gill cover
鰓孔[eraana] gill slit
鰓裂[sairetsu] gill slit

腸鰓類[chousairui] enteropneusts (hemichordates of class Enteropneusta)
翼鰓類[yokusairui] pterobranchs (hemichordates of class Pterobranchia)
海鰓[umiera] sea pen (any coelenterate of the family Pennatulidae or related families)
板鰓類[bansairui] elasmobranchs