Twinned crystal is a term that is commonly used in the field of mineralogy and crystallography. It refers to a crystal structure that is made up of two or more separate crystals that have grown together in a specific way. There are several different synonyms that can be used to describe a twinned crystal, including intergrown crystal, twinned obverse, and twin crystal lattice. Other terms that are often used in this context include twinned plane, twin axis, and twin plane intersection. Overall, the use of synonyms can help to provide greater clarity and precision when describing the properties and characteristics of twinned crystals in scientific contexts.