%stach%

a. [ From Eustachi, a learned Italian physician who died in Rome, 1574. ] (Anat.) (a) Discovered by Eustachius. (b) Pertaining to the Eustachian tube; as, Eustachian catheter. [ 1913 Webster ]

Eustachian catheter, a tubular instrument to be introduced into the Eustachian tube so as to allow of inflation of the middle ear through the nose or mouth. --
Eustrachian tube (Anat.), a passage from the tympanum of the ear to the pharynx. See Ear. --
Eustachian valve (Anat.), a crescent-shaped fold of the lining membrane of the heart at the entrance of the vena cava inferior. It directs the blood towards the left auricle in the fetus, but is rudimentary and functionless in the adult. [ 1913 Webster ]

n. [ F. ] Mustache. [ 1913 Webster ]

n. A large bushy moustache.
Syn. -- mustachio, handle-bars. [ WordNet 1.5 ]

n.; pl. Mustaches [ Written also moustache. ] [ F. moustache, It. mostaccio visage, mostacchio mustache, fr. Gr. my`stax upper lip and the beard upon it; cf. ma`stax mouth: cf. Sp. mostacho. ] 1. That part of the beard which grows on the upper lip; hair left growing above the mouth. [ 1913 Webster ]

2. (Zool.) A West African monkey (Cercopithecus cephus). It has yellow whiskers, and a triangular blue mark on the nose. [ 1913 Webster ]

3. (Zool.) Any conspicuous stripe of color on the side of the head, beneath the eye of a bird. [ 1913 Webster ]

4. A stain or discoloration on the upper lip of a person; as, wearing a milk mustache. [ informal ] [ PJC ]

n.; pl. Mustachios A mustache. Longfellow. [ 1913 Webster ]

a. Having a mustache or mustachios.
Syn. -- mustached. [ 1913 Webster ]

n. [ OE. pistace, fr. F. pistache. See Pistachio. ] (Bot.) The anacardiaceous tree Pistacia vera, which yields the pistachio nut; also, the nut itself and the flavoring extract prepared from it. Called also pistachio. [ Webster 1913 Suppl. ]

n. [ It. pistacchio (cf. Sp. pistacho, F. pistache), fr. L. pistacium, Gr. &unr_;, &unr_;, fr. Per. pistah. Cf. Fistinut. ] (Bot.) The nut of the Pistacia vera, a tree of the order Anacardiaceæ, containing a kernel of a pale greenish color, which has a pleasant taste, resembling that of the almond, and yields an oil of agreeable taste and odor; -- called also pistachio nut. It is wholesome and nutritive. The tree grows in Arabia, Persia, Syria, and Sicily. [ Written also pistachia. ] [ 1913 Webster ]

2. The small anacardiaceous tree (Pistacia vera), of southern Europe and Asia Minor, which bears the pistachio nut. Called also pistache. [ Webster 1913 Suppl. ]

3. (Cookery) The flavor of the pistachio nut, or an ice or confection flavored with it. [ Webster 1913 Suppl. ]

4. Pistachio green. [ Webster 1913 Suppl. ]