تر doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 3 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• تَرَّ Form 1

  1 تَرَّ رأى تر ورى , (T, M, A, K,) aor. َتِرَ and َتُرَ , (M, K,) the latter irregular, (TA,) inf. n. تَرٌّ and تُرُورٌ, (M, K,) It (a bone, M, K, or anything, M,) became severed, separated, or cut off, (T, M, K,) by a b…

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• تَرٌّ

  تَرٌّ رأى تر ورى : see تَارٌّ: -A2- and تُرٌّ.…

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• تُرٌّ

  تُرٌّ رأى تر ورى The string, or line, which is extended upon, or against, a building, (As, S, M,) and according to which one builds, called in Arabic the إِمَام; (As, M;) the string, or line, by which a building is propo…

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