primitive (redirected from primitivity)

primitive /prim·i·tive/ (prim´ĭ-tiv) first in point of time; existing in a simple or early form that shows little complexity.

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prim·i·tive (prm-tv)

adj.

1. Primary; basic.

2. Of or being an earliest or original stage.

3. Being little evolved from an early ancestral type.

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primitive

[prim′itiv]

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.

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primitive [prim´ĭ-tiv]

first in point of time; existing in a simple or early form that shows little complexity.

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primitive

first in point of time; existing in a simple or early form; showing little evolution.

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primitive groove

longitudinal furrow in the primitive streak of the embryo.

primitive knot

see hensen's node.

primitive node

enlarged cranial end of the primitive streak.

primitive streak

the thickened median area of the epiblast which sets out the future longitudinal axis of the early embryo.

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primitive

adjective Embrology Undifferentiated; undeveloped; before development of 1º germ layers–ectoderm, endoderm, mesoderm Psychiatry Pertaining to the early development of the personality