| Subject | English | Spanish |
| med. | annular ligament of base of stapes | ligamento anular de la base del estribo |
| agric. | barking the base of cuttings | descortezado |
| agric. | base of a cutting | talón de la estaca |
| scient., life.sc. | base of a geometrical figure | línea isohipsa |
| industr. | base of a textile product | soporte |
| chem. | base of active ingredient | soporte del producto activo |
| med. | base of an artificial limb | pie artificial |
| el. | base of an electric lamp | casquillo de bombilla |
| transp. | base of ballast | plataforma de la vía |
| chem. | base of cartridge case | base de los casquillos |
| meteorol. | base of clouds | techo de las nubes |
| meteorol. | base of clouds | base de las nubes |
| mil., artil. | base of fire | tiro defensivo |
| mil., artil. | base of fire | base de fuego |
| meteorol. | base of inversion | base de la inversión |
| industr., construct., met. | base of neck | base del cuello |
| stat. | base of operation | lugar habitual de trabajo |
| gen. | base of operations | base de operaciones |
| mech.eng. | base of rim | base de la llanta |
| construct. | base of slope | pie del talud |
| nat.sc. | base of tail | nacimiento de la cola |
| med. | base of the bladder | fondo de la vejiga |
| med. | base of the bladder | base de la vejiga |
| agric. | base of the grain | base del grano |
| med. | base of the metacarpals | base de los huesos metacarpianos (basis ossium metacarpalium, basis ossium metacarpi) |
| med. | base of the metatarsals | base de los huesos metatarsianos (basis ossium metatarsalium, basis ossium metatarsi) |
| med. | base of the nose | base de la nariz (basis nasi) |
| construct. | base of the notch | umbral del vertedero |
| med. | base of the patella | base de la rótula (basis patellae) |
| health. | base of the penis | base del pene |
| transp. | base of the rail | patín del riel |
| transp. | base of the rail | base del riel |
| transp. | base of the rail | patín del carril |
| transp. | base of the rail | base del carril |
| med. | base of the renal pyramids | base de las pirámides de Malpighi (basis pyramidis renalis) |
| med. | base of the sacrum | base del sacro (basis ossis sacri) |
| med. | base of the skull | base del cráneo (basis cranii, basis encephali) |
| med. | base of the stapes | base del estribo (basis stapedis) |
| weap. | base of trajectory | base de la trayectoria |
| mech.eng. | base of tread groove | fondo de ranura |
| med. | fissure of the base of the stapes | fisura de la base del estribo |
| industr., construct. | floor covering with a base of paper or paperboard | artículo empleado para recubrir suelos con soporte de papel o cartón |
| transp., nautic., construct. | floor of dry dock and foundation of machinery house on a general base of lean concrete | solera del dique y fundación de la casa de máquinas sobre cimiento general de hormigón pobre |
| med. | internal base of the skull | base interna del cráneo |
| work.fl., IT | language base of a documentary language | base lingüística de un lenguaje documental |
| med. | mobilization of base of stapes | movilización de la base del estribo |
| med. | resection of base of stapes | resección de la base del estribo |
| transp. | wheel-base of a bogie | empate de un bogie |
| transp. | wheel-base of a vehicle | distancia entre ejes extremos |
| transp. | wheel-base of a vehicle | empate |
| transp. | wheel-base of a vehicle | longitud de rodado |
| transp. | wheel-base of a vehicle | base rodante rígida |
| transp., tech. | wheel base of the trolley | distancia entre ejes del carro |