What does dimorphic mean?
Dimorphic is an adjective describing anything that exists in two distinctly different forms. It is chiefly a scientific term: in biology, a species is said to be dimorphic when its members occur in two contrasting physical types, most familiarly when males and females differ markedly in size, colouring, or structure — a phenomenon known as sexual dimorphism. In mycology, dimorphic fungi can grow as moulds in one environment and switch to a yeast form in another, an ability with real medical significance. Beyond biology, the word can be applied more generally to any system or object that takes two clear forms, though such figurative use remains uncommon. Derived from Greek roots meaning 'two-formed,' it pairs naturally with its noun form, dimorphism. Because it is precise and technical, dimorphic carries a formal register and appears mainly in textbooks, research papers, and science journalism rather than casual speech.
adjectiveExisting in or characterized by two distinct forms; in biology, occurring in two different morphological types within the same species.
- Biology: occurring in two distinct forms within the same species, as in sexual dimorphism where males and females differ in size, coloration, or structure.
- General: existing in two clearly different forms or varieties.
- Mycology: of fungi, capable of growing as both yeast and mold depending on environmental conditions.
"The species is dimorphic, with males sporting brilliant plumage while females remain drab and camouflaged."
"Many birds of prey are sexually dimorphic, with females noticeably larger than males."
"Histoplasma capsulatum is a dimorphic fungus that grows as a mold in soil but converts to a yeast form inside the human body."
In some dimorphic deep-sea anglerfish, the male is thousands of times smaller than the female — he essentially spends his life fused to her body.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dimorphic
Dimorphic derives from the Greek elements 'di-' meaning 'two' and 'morphē' meaning 'form' or 'shape,' combined through the adjectival suffix '-ic.' The related noun 'dimorphism' entered English usage in the nineteenth century alongside the rise of modern biology, when naturalists needed precise vocabulary for species exhibiting two distinct forms. The same Greek root 'morphē' gives English a wide family of cognates, including polymorphic, isomorphic, metamorphic, and anthropomorphic.
Related word forms
How dimorphic is actually used
Primarily a technical term used in biology, zoology, botany, and mycology; rare in everyday conversation. Most frequently encountered in the phrase 'sexually dimorphic.' The corresponding noun is 'dimorphism,' which often appears in phrases such as 'sexual dimorphism' or 'seasonal dimorphism.'
Easily confused with dimorphic
Dichotomous describes something divided into two branches or mutually exclusive categories (as in a dichotomous question), while dimorphic specifically refers to the existence of two distinct physical forms.