Meaning

• A callow young bird.

• A callow or teneral phase of an insect or other arthropod, typically shortly after ecdysis, while the skin still is hardening, the colours have not yet become stable, and as a rule, before the animal is able to move effectively.

• An alluvial flat.

Meaning

• Unfledged (of a young bird).

• (by extension) Immature, lacking in life experience.

  "Those three young men are particularly callow youths."

• Lacking color or firmness (of some kinds of insects or other arthropods, such as spiders, just after ecdysis); teneral.

• Shallow or weak-willed.

• (of a brick) Unburnt.

• Of land: low-lying and liable to be submerged.

• Bald.