Word relationships
Synonyms
h, atomic number 1
Local English word record
hydrogen
a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
Practice this wordSource and method
This page uses the locally materialized K5English vocabulary cohort. WordNet, where present, is enrichment only and does not determine K-5 admission.