An organic compound consisting entirely of hydrogen and carbon atoms.

Relating to or affected by hydrocephalus, a condition where excess fluid accumulates in the brain.

A gel in which water is the dispersion medium, often used in medical and cosmetic applications.

A colorless, odorless gas that is the lightest and most abundant element in the universe, with atomic number 1.

A molecule or atom that accepts hydrogen atoms or ions during a chemical reaction.

A weak bond between two molecules resulting from an electrostatic attraction between a hydrogen atom and a more electronegative atom.

A measure of the concentration of hydrogen ions in a solution, indicating its acidity or alkalinity.

The chemical reaction where hydrogen is added to a compound, often used to saturate organic compounds.

A chemical reaction in which a compound is broken down by reaction with water.

A positively charged ion (H₃O⁺) formed when a hydrogen ion combines with a water molecule.