noun, masculine/ɡu.lo/plural: goulots
goulot is masculine in French.
bottleneck (narrow part of a bottle)
“Heureusement, la patronne arriva, le goulot des bouteilles entre les doigts et le pain sous le bras.” — Fortunately, the boss arrived, the bottlenecks of the bottles between her fingers and the bread under her arm.
Related: boire au goulot, goulot d'étranglement, refouler du goulot
From goule, variant of gueule.