(mineralogy) two interwoven crystals that are mirror images on each other
"The geologist carefully examined the twin quartz specimen to observe how the two interwoven crystal halves formed perfect mirror images of each other."
the third sign of the zodiac; the sun is in this sign from about May 21 to June 20
"People born between May 21 and June 20 are said to be under the influence of Twins."
plural of twin
"The twins in her bra were perfectly matched and comfortable to wear."
A woman's breasts
Third-person singular simple present indicative form of twin
"The twins play together every day, but he does not always join them because he prefers to read alone."
In plain English: To twin means to match two things so they look exactly alike, usually by pairing them together as a set.
"The twin towers stood side by side, looking exactly alike."
The Minnesota Twins team.
"I bought tickets to see the Minnesota Twins play at Target Field last night."