As a noun impact

is the striking of one body against another; collision.

As a verb impact

is to compress; to compact; to press or pack together.

As an adjective preimpact is

describing a situation before an impact.

As a noun equilibrium

is balance, equilibrium.

As an adjective preequilibrium is

before equilibrium.

As a noun notochord

is a flexible rodlike structure that forms the main support of the body in the lowest chordates; a primitive spine.

As an adjective prechordal is

in front of the notochord.

As a noun precession

is precession.

As an adjective precessional is

of or pertaining to precession.

Allomaternal is a related term of allomother.

As an adjective allomaternal

is relating to an allomother.

As a noun allomother is

(zoology) a human or other creature that provides some maternal care for the young born of another.

As a verb allomother is

to provide maternal care for another creature's young.

As nouns the difference between clamping and preclamping

is that clamping is the act by which something is clamped while preclamping is clamping before another operation.

As a verb clamping

is .

In biology terms the difference between prezygotic and postzygotic

is that prezygotic is preceding the zygotic period while postzygotic is following a zygotic stage.

As a noun pick

is a tool used for digging; a pickaxe.

As a verb pick

is to grasp and pull with the fingers or fingernails.

As an adjective pickable is

able to be picked.

Pickable is a derived term of pickability.

As a noun pickability

is the quality of being pickable.

As an adjective pickable is

able to be picked.

As nouns the difference between reagent and potentiator

is that reagent is a compound or mixture of compounds used to treat materials, samples, other compounds or reactants in a laboratory or sometimes an industrial setting while potentiator is a reagent that enhances sensitization of an antigen.