single-celled

The adjective 'single-celled' is a modern scientific compound formed from established English elements. 'Single' traces back to Latin singulus, meaning one or individual, which itself may derive from a Proto-Indo-European root meaning one. 'Cell' originates from Latin cella, denoting a small chamber, a term adopted into biology by Robert Hooke in the 17th century to describe the basic structural units he observed in cork. The suffix '-ed' is a native English grammatical marker used to form adjectives from nouns, indicating possession of the specified feature. Thus, the literal morphemic construction "having a single cell" directly and logically yields the modern biological term describing organisms like bacteria and protozoa.

Structure: single (one) + cell (basic unit) + ed (adjective suffix) - single: From Latin singulus (one, individual). Functional role: Modifying root indicating quantity. - cell: From Latin cella (small room, storeroom). Functional role: Core root indicating the biological unit. - ed: From Old English -ede, adjectival suffix. Functional role: Derivational suffix forming adjectives meaning "having, provided with".