A mark, sign, or distinguishing feature located on or related to the head of something, such as the mark on a fish's head or a dividing line.
Compound of 'head' (Old English 'heafod') and 'mark' (Old English 'mearc', meaning a sign or boundary). Used in natural history and technical contexts.
In ichthyology, headmarks on fish are crucial identifying features—many species have distinctive head patterns that scientists use to tell them apart, making this a specialized but meaningful term.
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