hygro-, hygr- +

(Greek: moist, moisture, wet, damp)

hygro-orthokinetic, hygroorthokinetic
Relating to change in the rate of random movement of an organism in response to a humidity stimulus.
hygropetric
A reference to an organism living in the surface film of water on rocks.
hygrophanous
Having such a structure as to be diaphanous when moist, and opaque when dry.

The hygrophanous description refers to the color change of mushroom tissue (especially the pileus surface or the "cap" of a fungal fruiting body) as it loses or absorbs water; which causes the pileipellis to become more transparent when wet and opaque when dry.

hygrophile
Any creature thriving in moist habitats.
hygrophilic
Having an affinity for moisture.
hygrophilous
1. A description of plants that are adapted to growing in damp places.
2. Preferring, or living, where there is an abundance of moisture.
hygrophily
Any organism that thrives, or prefers, living in moist habitats or places.
hygrophobia (s) (noun) (no plural)
A strong dislike of liquids in any form: Sam somehow never liked to drink, especially wine and water, and he also had an aversion to dampness and moisture, and after he consulted his doctor, he was diagnosed as having hygrophobia!
hygrophobic (adjective), more hygrophobic, most hygrophobic
Referring to the intolerance of existing satisfactorily in moist situations: Some hygrophobic plants, including cacti, can grow and develop successfully in deserts, where there are arid atmospheric conditions.
hygrophobous
1. A condition whereby there is a fear, or strong dislike, of liquids in any form; especially, wine and water; also an aversion to dampness or moisture.
2. In biology, relating to an intolerance of moist situations.
hygrophyte
A plant living in a wet or moist habitat, typically lacking xeromorphic features; such as, plants or plant parts that are adapted for survival in dry conditions.
hygrophytic
Relating to plants living in wet, or moist, environments.
hygroscope
An hygrometer, or an instrument that indicates changes in atmospheric humidity, that shows variations in the relative humidity of the atmosphere.

Unlike a hygrometer, a hygroscope only indicates a change in relative humidity, without measuring the magnitude of the change.

hygroscopic
1. Capable of absorbing, or sensitive to, water from moist air.
2. Relating to a compound that easily absorbs moisture from the atmosphere.
hygroscopic coefficient, hygroscopic capacity
The percentage of water that will be absorbed by a completely dry mass of soil and be held in equilibrium if the soil comes in contact with a saturated atmosphere.

Cross references of word families that refer to "water": aqua-; hydat-; hydro-.