An object such as a pillar used by an observer to calculate the meridian altitude of the sun (that is, the altitude of the sun when it reaches the observer's meridian), for the purpose of determining the observer's latitude.
A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
An object such as a pillar or a rod that is used to tell time by the shadow it casts when the sun shines on it, especially the pointer on a sundial.
The index of the hour circle of a globe.
A number representing the increment between two figurate numbers (“numbers equal to the numbers of dots in geometric figures formed of dots”).
A small, usually unmanned, spacecraft used to acquire information or measurements about its surroundings.
A tube attached to an aircraft which can be fitted into the drogue from a tanker aircraft to allow for aerial refuelling.
Something which penetrates something else, as though to explore; something which obtains information.
An anal probe, a fictional instrument commonly used by aliens on abducted humans.
An investigation or inquiry.
a move with multiple answers seeking to make the opponent choose and commit to a strategy
Any group of atoms or molecules radioactively labeled in order to study a given molecule or other structure
An act of probing; a prod, a poke.
A small device, especially an electrode, used to explore, investigate or measure something by penetrating or being placed in it.
Any of various medical instruments used to explore wounds, organs, etc.
To insert a probe into.
To explore, investigate, or question