meristem

As a noun meristem

is meristem (zone of active cell division).

As an adjective undefined is

lacking a definition or value.

As nouns the difference between meristem and callus

is that meristem is meristem (zone of active cell division) while callus is a hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.

As a verb callus is

to form such hardened tissue.

In botany terms the difference between cambium and meristem

is that cambium is a layer of cells between the xylem and the phloem that is responsible for the secondary growth of roots and stems while meristem is the plant tissue composed of totipotent cells that allows plant growth.

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As a noun meristem is

the plant tissue composed of totipotent cells that allows plant growth.

As nouns the difference between taxonomy and meristem

is that taxonomy is the science or the technique used to make a classification while meristem is meristem (zone of active cell division).

As nouns the difference between meristem and procambium

is that meristem is meristem (zone of active cell division) while procambium is (botany) a meristem that lies just inside the protoderm and develops into primary xylem and primary phloem.

As nouns the difference between meristem and protoderm

is that meristem is meristem (zone of active cell division) while protoderm is (label) the primary meristem from which the epidermis develops.