Relating to or denoting fish or vertebrates without a cleithrum bone (a bone in the pectoral girdle).
From Greek 'a-' (not) + 'kleithron' (bar, bolt), referring to the absence of a particular skeletal element in fish anatomy.
Ichthyologists (fish scientists) use these hyper-specific skeletal terms to classify fish — it's like having a secret anatomical language where each bone presence or absence tells the evolutionary story.
Complete word intelligence in one call. Free tier — 50 lookups/day.