As an adjective extracellular

is occurring or found outside of a cell.

As a noun osmosensor is

(biochemistry) any of several classes of organic compound that undergo transitions between "off" and "on" conformations in response to changes in extracellular water activity (direct osmosensing) or resulting changes in cell structure (indirect osmosensing).

As nouns the difference between water and osmosensor

is that water is (uncountable) a chemical, found at room temperature and pressure as a clear liquid, having the formula h₂o, required by all forms of life on earth while osmosensor is (biochemistry) any of several classes of organic compound that undergo transitions between "off" and "on" conformations in response to changes in extracellular water activity (direct osmosensing) or resulting changes in cell structure (indirect osmosensing).

As a verb water

is to pour water into the soil surrounding (plants).

As nouns the difference between activity and osmosensor

is that activity is the state or quality of being active; nimbleness; agility; vigorous action or operation; energy; active force; as, an increasing variety of human activities while osmosensor is (biochemistry) any of several classes of organic compound that undergo transitions between "off" and "on" conformations in response to changes in extracellular water activity (direct osmosensing) or resulting changes in cell structure (indirect osmosensing).

Osmosensor is a related term of osmosensing.

As nouns the difference between osmosensing and osmosensor

is that osmosensing is the regulation of cell turgor in response to changes in the osmolarity of the external environment while osmosensor is any of several classes of organic compound that undergo transitions between "off" and "on" conformations in response to changes in extracellular water activity (direct osmosensing) or resulting changes in cell structure (indirect osmosensing).

As a proper noun fold

is earth.

As a noun airstair is

a set of stairs permitting entry to and exit from an aeroplane, typically built into a folding door.

As nouns the difference between door and airstair

is that door is door while airstair is a set of stairs permitting entry to and exit from an aeroplane, typically built into a folding door.

As a noun microrheology

is a technique capable of measuring microviscosity.

As an adjective microrheological is

of or pertaining to microrheology.

As a noun drink

is drink (alcoholic).

As an adjective quaffable is

(informal|usually referring to wine) easy to drink.

Drinkable is a synonym of quaffable.

As adjectives the difference between drinkable and quaffable

is that drinkable is (of water) safe to drink while quaffable is (informal|usually referring to wine) easy to drink.

As a noun drinkable

is (usually in plural) that which can be drunk.

As nouns the difference between microviscosity and microrheology

is that microviscosity is friction experienced by a single particle undergoing diffusion because of its interaction with its environment at the micrometer length scale while microrheology is a technique capable of measuring microviscosity.