| English | Spanish | |
|---|---|---|
| Engineering | ||
| Engineering | straight tooth wheel | rueda de dientes rectos [f] |
| Engineering | bevel gears with straight and spiral tooth system | engranajes cónicos con sistema de dientes rectos y helicoidales [m/pl] |
| Marine Biology | ||
| Marine Biology | straight-tooth weasel shark | comadreja coluda |
| Automotive | ||
| Automotive | straight tooth meshing gear | engranaje de dientes rectos [m] |
