| Subject | English | Spanish |
| arts. | American Friends of the Middle East | Norteamericanos Amigos del Oriente Medio |
| health. | anterior or middle third of the neck | tercio anterior o medio del cuello |
| med. | axillary branch of middle lobe bronchus | bronquio segmentario lateral |
| med. | branch of hyparterial bronchus to middle lobe of right lung | bronquio lobar medio |
| med. | chondropharyngeal part of middle constrictor muscle of pharynx | músculo condrofaríngeo |
| UN, ecol. | Ecological Management of Arid and Semi-Arid Rangelands in Africa, the Near East and Middle East | Ordenación ecológica de los pastos áridos y semiáridos del África, el Cercano y el Medio Oriente |
| polit. | Group for Study and Defense of Ecosystems of the Lower and Middle Amazon Region | Grupo de Estudio y Defensa de los Ecosistemas de la Región Baja y Media del Amazonas |
| chem. | hydrogenation of middle distillate | hidrogenación del destilado intermedio |
| med. | inferior part of the middle frontal gyrus | segmento orbital de la circunvalación frontal media |
| vet.med. | inflammation of the middle ear | otitis media |
| org.name. | International Cooperative Programme on the Ecological Management of Arid and Semi-Arid Rangelands in Africa, the Near East and Middle East | EMASAR |
| environ., UN | International Cooperative Programme on the Ecological Management of Arid and Semi-Arid Rangelands in Africa, the Near East and Middle East | Programa cooperativo internacional sobre la ordenación ecológica de pastos áridos y semiáridos en Africa y el Cercano y Medio Oriente |
| med. | medial part of the branch of the right middle lobe of the pulmonary vein | parte medial derecha de la rama del lóbulo medio de la vena pulmonar (pars medialis rami lobi medii venae pulmonalis superioris dextrae) |
| commun. | middle axis of the chamber | eje medio de la cámara |
| mech.eng. | middle circle of the toroid | circunferencia media del toro |
| tech., industr., construct. | middle condenser of a drafting arrangement | condensador intermedio de un sistema de estirado |
| tech., industr., construct. | middle condenser rail of a drafting arrangement | rail del condensador intermedio de un sistema de estirado |
| med. | middle constrictor of pharynx muscle | músculo hiofaringeo |
| med. | middle constrictor of pharynx muscle | músculo constrictor medio de la faringe |
| med. | middle layer of cerebellar cortex | capa media de la corteza cerebelar |
| med. | middle layer of cerebellar cortex | capa de Purkinje |
| med. | middle lobe bronchus of right lung | bronquio lobar medio |
| med. | middle lobe of hypophysis cerebri | lóbulo mediano de la hipófisis cerebral |
| med. | middle lobe of the hypophysis | lóbulo medio de la hipófisis |
| transp., mech.eng. | middle of axle | cuerpo de eje |
| tech., industr., construct. | middle of board | capa interior |
| stat. | middle of the interval of variation | mitad del rango |
| stat. | middle of the interval of variation | semi-rango |
| industr., construct. | middle of the last | línea medianera de la horma |
| mater.sc. | middle range of technological intensity | sector de media intensidad tecnológica |
| med. | middle third of the face | tercio medio de la cara |
| industr., construct., met. | middle zone of lens | zona central de la lente |
| industr., construct., met. | middle zone of lens | centro |
| industr., construct. | middles of jute | calidad mediana de yute |
| industr., construct. | middles of jute | calidad media |
| baseb. | over the middle of the plate | por el medio del plato |
| gen. | Partnership for Progress and a Common Future with the Region of the Broader Middle East and North Africa | Asociación para el Progreso y el Futuro Común con la región del Amplio Oriente Próximo y Norte de África |
| med. | pectoral branch of middle lobe bronchus | bronquio segmentario medio |
| polit. | Peoples of the Middle East | Pueblos del Oriente Medio |
| med. | superior part of the middle frontal gyrus | parte superior de la circunvolución frontal media |