BOCA DE INYECCION (NOZZLE)

La boca de inyección utilizada ha sido diseñada para controlar la dirección de
flujo de la mezcla fundida. Este componente presenta una sección interior cónica,
con entrada al barril de mezcla de 2.5 mm y salida al molde de 4 mm. La longitud es de 35mm.

https://core.ac.uk/download/pdf/30043275.pdf

The reference doesn't refer to a syringe but in Spain 'boquilla' is often translated as 'nozzle'.

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Note added at 40 mins (2016-12-31 16:58:12 GMT)
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A syringe is a simple pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube (called a barrel), allowing the syringe to take in and expel a liquid or gas through an orifice at the open end of the tube. The open end of the syringe may be fitted with a hypodermic needle, a nozzle, or tubing to help direct the flow into and out of the barrel. Syringes are often used to administer injections, insert intravenous drugs into the bloodstream, apply compounds such as glue or lubricant, and measure liquids.

https://en.wikipedia.org/wiki/Syringe#Governmental_control_o...

Slide number 7

http://es.slideshare.net/victorhugoortuno/actual-inyectables

Micron-S Precision Nozzles
Dispense nozzles for high accuracy micro-dot dispensing. Micron-S nozzles have a Luer lock thread and can be used with any dispensing syringe, valve or pump.
Super low resistance molecular fluid flow. Significant cost savings over machined nozzles without sacrificing placement precision or deposition accuracy.

http://www.intertronics.co.uk/data/fisnar_500series_dispensi...