Noun

(en noun)

(obsolete) A paintbrush.

* 1590 , (Edmund Spenser), The Faerie Queene , III.0:

But living art may not least part expresse, / Nor life-resembling pencill it can paynt.

*, II.17:

*:why is it not lawfull for every man to pourtray himself with his pen, as it was for him to doe it with a pensell ?

Writing utensil that uses graphite (commonly referred to as lead). Regular pencils usually have a graphite shaft surrounded by wood. Also available in a mechanical version where the graphite length can be adjusted and sharpening is not needed.

(geometry) A family of geometric objects with a common property, such as the set of lines that pass through a given point in a projective plane.

(optics) An aggregate or collection of rays of light, especially when diverging from, or converging to, a point.

* 1863 , The Civil Engineer and Architect's Journal

When, by the pencil becoming oblique to the surface, the vergency produced on the pencil becomes changed, the primary and secondary focal points, V and H, separate

(medicine, archaic) A small medicated bougie.

Noun

(en noun)

A that ensures the door cannot be opened without the key.

* , chapter=5

, title= The Mirror and the Lamp , passage=Then everybody once more knelt, and soon the blessing was pronounced. The choir and the clergy trooped out slowly,

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=20 citation , passage=‘No. I only opened the door a foot and put my head in. The street lamps shine into that room. I could see him. He was all right. Sleeping like a great grampus. Poor, poor chap.’}}

Any flap, etc. that opens like a door.

A non-physical into the next world, a particular feeling, a company, etc.

(computing, dated) A . See (BBS door).