Lacking hair; hairless or characterized by absence of hair growth.
From Greek a- 'without' + thrix (trichos) 'hair' + -ous adjectival suffix. Used in both medical and biological contexts to describe hairless organisms or body parts.
Interestingly, some bacteria are described as 'atrichous' because they lack flagella (hair-like structures for movement), showing how biology borrows hair-related words beyond humans.
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