Alternative form of headborough

(ornithology) A moult, typically in penguins, in which most or all of the feathers are shed at the same time / (zoology) A similar process in some seals in which large areas of skin are lost

(education, chiefly attributive) A child seen not only as a client of the education system but also as a person whose play habits, home life, etc. contribute to their development.

Optical technique to make observations of a transparent specimen in a cone of converging rays of light.