culmen

(redirected from Culmen ridge)
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culmen

(ˈkʌlmən)
n, pl culmina
1. the summit
2. the external ridge on the upper mandible of a bird's bill
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References in periodicals archive ?
The following measurements were taken using a vernier caliper: bill (to nearest 0.1 mm), from tip to farthest point of exposed, non-feathered culmen ridge; total head length (to nearest 1 mm), from bill tip to back of skull (Green, 1980); and tarsus (to nearest 0.1 mm), with foot and tibiotarsus held perpendicular to tarsometatarsus, measuring the distance between the extreme bending points (Alatalo and Lundberg, 1986).