Membrane bone and Os

Membrane bone noun - Any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull.

Os and membrane bone are semantically related. In some cases you can use "Os" instead a noun phrase "Membrane bone".

Os noun - A hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known.

Membrane bone and os are semantically related. Sometimes you can replace phrase "Membrane bone" with "Os", this terms are similar.