Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word astrolabium could not be parsed. Trying a normal dictionary lookup:
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† astrŏlŏgĭa, ae, f., = ἀστρολογία, knowledge of the stars, astronomy (class. for the later astronomia, while astrologia was used to designate astrology exclusively first in late Lat., Hier. adv. Pelag. 1, 8; cf. Isid. Orig. 8, 9), Cic. Div. 2, 42, 87 sqq.; id. de Or. 1, 16, 69; id. Off. 1, 6, 19: astrologiam Atlas Libyae filius, ut alii Aegyptii, ut alii Assyrii invenerunt, Plin. 7, 56, 57, § 203; also a work upon astronomy: occasum matutinum vergiliarum Hesiodus, nam hujus quoque nomine exstat astrologia, tradidit fieri, id. 18, 25, 57, § 213.
† astrŏlŏgus, i, m., = ἀστρολόγος.