Word

Celestial equator

The circle around the celestial sphere that is halfway between the celestial poles. It can be thought of as the plane of Earth’s equator projected out onto the sphere.

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Figurehead

The figure, statue, or bust, on the prow of a ship. A person who allows his name to be used to give standing to enterprises in which he has no responsible interest or duties; a nominal, but not real, head or chief.

Keelhaul

To haul under the keel of a ship, by ropes attached to the yardarms on each side. It was formerly practiced as a punishment in the Dutch and English navies.

Mean temperature

The average of the maximum and the minimum temperatures for a particular period; the mean equals the sum of the max and min divided by two.

Dewpoint temperature

The temperature to which a given parcel of air must be cooled before it becomes saturated; the temperature of an object when dew first forms on it.

Diurnal Tide

A tide with one high water and one low water in a tidal day of approximately 24 hours.

Biddy

A name used in calling a hen or chicken. An Irish serving woman or girl.

Phenology

The study of natural periodic events in the life-cycle of plants (and animals).

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