4. (Mus.) (a) The closing of an aperture in the air passage, or pressure of the finger upon the string, of an instrument of music, so as to modify the tone; hence, any contrivance by which the sounds of a musical instrument are regulated. The organ sound a time survives the stop. Daniel.
(b) In the organ, one of the knobs or handles at each side of the organist, by which he can draw on or shut off any register or row of pipes; the register itself; as, the vox humana stop.
5. (Arch.)
Defn: A member, plain or molded, formed of a separate piece and fixed to a jamb, against which a door or window shuts. This takes the place, or answers the purpose, of a rebate. Also, a pin or block to prevent a drawer from sliding too far.
6. A point or mark in writing or printing intended to distinguish the sentences, parts of a sentence, or clauses; a mark of punctuation. See Punctuation.
7. (Opt.)
Defn: The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
8. (Zoöl.)
Defn: The depression in the face of a dog between the skull and the nasal bones. It is conspicuous in the bulldog, pug, and some other breeds.
9. (Phonetics)