Rock that is ground more finely than gravel, but is not as fine as silt (more formally, see grain sizes chart), forming beaches and deserts and also used in construction.
From Middle English sand, from Old English sand, from Proto-Germanic *samdaz (compare West Frisian sân, Dutch zand, German Sand, Danish, Swedish and Norwegian sand), from Proto-Indo-European *sámh₂dʰos (compare Latin sabulum, Ancient Greek ἄμαθος), from *sem- (compare English dialectal samel, Old Irish do·essim, Latin sentina, Lithuanian sémti, Ancient Greek ἀμάω, ἄμη).
From Middle English sanden, from the noun (see above).