twin¹ /twin/

1. Either of two born at a single birth
2. One very like, or closely associated with, another
3. A counterpart
4. (in pl with cap and the) Gemini
5. A pair of twins or pair generally (obsolete)
6. A combination of two crystals symmetrically united about a plane that is a possible face of each or an axis that is a possible edge of each, or of more than two by repetition

1. Twofold, double
2. Born two at one birth
3. Forming one, or consisting of both, of two identical or very similar parts or counterparts
4. Very like another

To couple together, or to produce, like a twin or twins

1. To be born at the same birth
2. To give birth to two at one birth
3. To be paired or suited

twinˈer noun (de la Mare)

A double limerick

twinˈling noun (now dialect)

A twin

twinned adjective

1. Produced at one birth
2. Constituting a twin
3. Paired, matched

twinnˈing noun

twinˈship noun

The condition or relation of a twin or twins

twin axis noun

The axis of symmetry of a twin crystal

twin bed noun

Either of a matching pair of single beds

twin-beddˈed adjective

twin birth noun

1. A birth of twins
2. A twin
3. A pair of twins

twinˈ-born adjective

Born at the same birth

twin brother noun

A brother born at the same birth

twin-camˈ adjective

(of an engine) having two camshafts

twin crystal or twinned crystal noun (crystallography, mineralogy)

A crystal composed of two or more individuals in a systematic crystallographic orientation with respect to one another

twin-enˈgined adjective

(chiefly of an aircraft) having a pair of engines

twinˈflower noun

A N American plant of the genus Linnaea having paired flowers

twin-lensˈ adjective

(of a camera) having two identical sets of lenses

twin paradox noun

A phenomenon suggested by the theory of relativity which imagines a scenario in which one of a pair of twins lives in the normal way, while the other twin is sent out in a spaceship travelling at great speeds, with the effect that the travelling twin eventually returns younger than the other twin

twin plane noun

The plane of symmetry of a twin crystal

twinˈ-screw adjective

(of a ship) with two propellers on separate shafts

twinˈset noun

A cardigan and jumper made more or less to match

• untethers
• unthanked
• unthankful
• unthankfully
• unthankfulness
• unthankfulnesses
• unthatch
• unthatched
• unthatches
• unthatching
• unthaw
• unthawed
• unthawing
• unthaws
• untheological
• unthickened
• unthink
• unthinkabilities
• unthinkability
• unthinkable
• unthinking
• unthinkingly
• unthinkingness
• unthinkingnesses
• unthinks