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first in point of time; existing in a simple or early form that shows little complexity.
Obsolete usage in embryology, replace by primordial.
[L. primitivus, fr. primus, first]
primitive/prim·i·tive/ (prim´ĭ-tiv) first in point of time; existing in a simple or early form that shows little complexity.
Etymology: L, primivus
1 undeveloped; undifferentiated; rudimentary; showing little or no evolution.
2 embryonic; formed early in the course of development; existing in an early or simple form. Compare definitive.
primitiveadjective Embrology Undifferentiated; undeveloped; before development of 1º germ layers–ectoderm, endoderm, mesoderm Psychiatry Pertaining to the early development of the personality
1. Relating to a primordium.
primitiveof ancient origin but present in modern organisms in an unmodified and unspecialized form.
first in point of time; existing in a simple or early form; showing little evolution.
longitudinal furrow in the primitive streak of the embryo.
see hensen's node.
enlarged cranial end of the primitive streak.
the thickened median area of the epiblast which sets out the future longitudinal axis of the early embryo.