contraparallelogram
|con-tra-par-al-le-log-ram|
🇺🇸
/ˌkɑn.trəˌpærəˈlɛl.əɡræm/
🇬🇧
/ˌkɒn.trəˌpærəˈlɛl.əɡræm/
crossed (self-intersecting) parallelogram
Etymology
'contraparallelogram' originates from English formation combining the prefix 'contra-' (from Latin 'contra', meaning 'against' or 'opposite') and 'parallelogram' (from Greek 'parallēlōgrammon').
'contraparallelogram' is a modern descriptive formation (akin to 'antiparallelogram'); the base element 'parallelogram' comes from Greek 'parallēlōgrammon' ('para-' beside + 'allēlōn' one another + 'grammon' drawing), which passed into Latin and then Middle English as 'parallelogram'. The contrasting prefix was later attached in English to denote the crossed/opposite form.
Initially the parts of the word simply signified an object 'opposite/against a parallelogram'; over time the compounded form came to denote specifically the self-intersecting (crossed) quadrilateral used in kinematics.
Meanings by Part of Speech
Noun 1
a self-intersecting quadrilateral (a crossed parallelogram) in which pairs of opposite sides are equal in length but the figure is crossed; also called an antiparallelogram, used in certain mechanical linkages and kinematic constructions.
The contraparallelogram in the linkage allows the output bar to move in the opposite direction to the input while preserving link lengths.
Synonyms
Antonyms
Last updated: 2025/11/11 03:26
