cleavage

• n.裂ける、割れる；[結晶]崩壊；[胚]排卵

cleave（裂く）から。裂け目のような溝があることから名付けられた。

cleavage (n.)

1816, in geology, "action of splitting (rocks or gems) along natural fissures," from cleave (v.1) + -age. General meaning "action or state of cleaving or being cleft" is from 1867.

The sense of "cleft between a woman's breasts in low-cut clothing" is first recorded 1946, defined in a "Time" magazine article [Aug. 5] as the "Johnston Office trade term for the shadowed depression dividing an actress' bosom into two distinct sections;" traditionally first used in this sense by U.S. publicist Joseph I. Breen (1888-1965), head of the Production Code Administration (replaced 1945 by Eric Johnston), enforcers of Hollywood self-censorship, in reference to Jane Russell's costumes and poses in "The Outlaw."

1. Cellular cleavage and proliferation was markedly inhibited.

細胞の分裂、増殖は明らかに抑制された。

2.This cleavage persisted during the whole civilized period.

この分裂は文明期全体にわたって存続している。dd>
家庭、私有制及び国の起源

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3.This marks the end of the cleavage stage of development.

これは卵裂発育段階の終了を示している。

4.He had made a great cleavage in his life.

彼はすでに自分の生活に溝を作っている。

5. Cleavage of secondary bonds can also be responsible for polymer deterioration.

二価結合の分裂はしばしばポリマー劣化を引き起こすこともある。