Moreover, it is evident that we have in the animal kingdom two kinds of dimorphism.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock
Many instances of this second form of dimorphism have been described under the name of alternation of generations.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock
Such a condition is called dimorphism; those minerals which crystallise in three systems are said to be trimorphous.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin