Wilt thou not ope thy heart to know What rainbows teach and sunsets
show?
Emerson.
O*pei"do*scope (?), n. [Gr. &?;, &?;, voice + &?; form + -scope.]
(Physics) An instrument, consisting of a tube having one end open and
the other end covered with a thin flexible membrance to the center of
which is attached a small mirror. It is used for exhibiting upon a
screen, by means of rays reflected from the mirror, the vibratory
motions caused by sounds produced at the open end of the tube, as by
speaking or singing into it. A. E. Dolbear.
Ope"let (?), n. (Zoöl.) A bright-colored European actinian (Anemonia,
or Anthea, sulcata); -- so called because it does not retract its
tentacles.
O"pen (?), a. [AS. open; akin to D. open, OS. opan, G. offan, Icel.
opinn, Sw. öppen, Dan. aaben, and perh. to E. up. Cf. Up, and Ope.] 1.
Free of access; not shut up; not closed; affording unobstructed ingress
or egress; not impeding or preventing passage; not locked up or covered
over; -- applied to passageways; as, an open door, window, road, etc.;
also, to inclosed structures or objects; as, open houses, boxes,
baskets, bottles, etc.; also, to means of communication or approach by
water or land; as, an open harbor or roadstead.
Through the gate, Wide open and unquarded, Satan passed.