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cleavage

cleavage In this historical source, cleavage means the early division of a fertilized egg into multiple cells as development begins.

In this historical source, cleavage means the early division of a fertilized egg into multiple cells as development begins. It can also mean the splitting of the mesoderm to form the body cavity in some animals.

Also see

Sources

Drafting source: Baldwin Dictionary of Philosophy and Psychology, 1901. 1901 New York Macmillan original; archive index checked 2026-10-18. “Cleavage” (Cleavage).
public-domain-US · Definition uses new wording; original source retains its stated licence. · Source snapshot SHA-256: 4105db320b643543da8643069f0aa832dcc0042c41d35f881ac00ad2a1445aff

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “cleavage.” Development preview.

Version 1 · SHA-256: c60801b6491926adcbf09aab8d4c4550b83f420486f67facd061f92d78b24700

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