Double; consisting of two similar and corresponding parts.
A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.
To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.
A rational intergrowth of two or more single crystals of the same mineral in a mathematically describable manner. The symmetry of the two parts may be reflected about a common plane, axis or center.
A hotel room containing two single beds.
Two or more crystals that intergrow in a specific method. May also be used in verb form, as "Two crystals may twin to form a cross."
grow as twins; "twin crystals"
a number that has proved to appear in either two squares and helps disprove its presence in another part of the grid
a room with two single beds
a single crystal composed of two or more parts with any part in reversed structural orientation to the next, or interpenetrated
A bed that measures 38" by 74".
Crystals intergrown in a fixed relationship, with unvarying angles.
A bed that measures 39 inches wide by 75 inches long.
Term referring to two SQers who share a brain. (see " SQer".) i.e. Zsenya and Moey or Jane and Alphie.