ˈbərthəˌlīd; (ˌ)bərˈthäˌlīd, -_lə̇d noun
( -s )
Etymology: C.L. Bertholl et + English -ide
: a solid chemical compound (as some metallic hydrides and the tungsten bronzes) that does not conform to the law of definite proportions : a nonstoichiometric compound — distinguished from daltonide